<s>
The	O
iPhone	B-Operating_System
4S	I-Operating_System
(	O
originally	O
styled	O
as	O
iPhone	B-Operating_System
4	I-Operating_System
S	I-Operating_System
,	O
retroactively	O
stylized	O
with	O
a	O
lowercase	O
'	O
s	O
 '	O
as	O
iPhone	B-Operating_System
4s	I-Operating_System
as	O
of	O
September	O
2013	O
)	O
is	O
a	O
smartphone	B-Application
that	O
was	O
designed	O
and	O
marketed	O
by	O
Apple	O
Inc	O
.	O
</s>
<s>
It	O
is	O
the	O
fifth	O
generation	B-Application
of	O
the	O
iPhone	B-Operating_System
,	O
succeeding	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
and	O
preceding	O
the	O
iPhone	B-Operating_System
5	I-Operating_System
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
October	O
4	O
,	O
2011	O
,	O
at	O
Apple	O
's	O
Cupertino	O
campus	O
,	O
and	O
was	O
the	O
final	O
Apple	O
product	O
announced	O
in	O
the	O
lifetime	O
of	O
former	O
Apple	O
CEO	B-Application
and	O
co-founder	O
Steve	O
Jobs	O
,	O
who	O
died	O
the	O
following	O
day	O
.	O
</s>
<s>
This	O
iPhone	B-Operating_System
was	O
named	O
"	O
4S	O
"	O
where	O
the	O
"	O
S	O
"	O
stood	O
for	O
Siri	B-Application
,	O
an	O
intelligent	B-Protocol
personal	I-Protocol
assistant	I-Protocol
that	O
was	O
initially	O
exclusive	O
to	O
the	O
4S	O
and	O
later	O
included	O
in	O
future	O
Apple	O
products	O
.	O
</s>
<s>
Retaining	O
most	O
of	O
the	O
external	O
design	O
of	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
,	O
the	O
4S	O
hosted	O
major	O
internal	O
upgrades	O
,	O
including	O
an	O
upgrade	O
to	O
the	O
Apple	O
A5	O
chipset	O
,	O
and	O
an	O
8-megapixel	O
camera	O
with	O
1080p	O
video	O
recording	O
.	O
</s>
<s>
It	O
debuted	O
with	O
iOS	B-Operating_System
5	I-Operating_System
,	O
the	O
fifth	O
major	O
version	O
of	O
iOS	B-Application
,	O
Apple	O
's	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
that	O
introduced	O
features	O
including	O
iCloud	B-Application
,	O
iMessage	O
,	O
Notification	B-Operating_System
Center	I-Operating_System
,	O
Reminders	B-Application
,	O
and	O
Twitter	B-Application
integration	O
.	O
</s>
<s>
Reviewers	O
noted	O
Siri	B-Application
,	O
the	O
new	O
camera	O
,	O
and	O
processing	O
speeds	O
as	O
significant	O
advantages	O
over	O
the	O
prior	O
model	O
.	O
</s>
<s>
It	O
was	O
succeeded	O
by	O
the	O
iPhone	B-Operating_System
5	I-Operating_System
as	O
Apple	O
's	O
flagship	O
smartphone	B-Application
on	O
September	O
12	O
,	O
2012	O
.	O
</s>
<s>
The	O
16	O
GB	O
iPhone	B-Operating_System
4S	I-Operating_System
remained	O
on	O
sale	O
at	O
a	O
reduced	O
price	O
point	O
,	O
with	O
the	O
32	O
and	O
64	O
GB	O
models	O
discontinued	O
.	O
</s>
<s>
The	O
16	O
GB	O
4S	O
was	O
also	O
subsequently	O
discontinued	O
in	O
September	O
2013	O
with	O
the	O
release	O
of	O
the	O
iPhone	B-Operating_System
5C	I-Operating_System
and	O
iPhone	B-Operating_System
5S	I-Operating_System
and	O
replaced	O
with	O
the	O
8	O
GB	O
model	O
which	O
was	O
offered	O
free	O
on	O
contract	O
in	O
the	O
United	O
States	O
.	O
</s>
<s>
The	O
4S	O
was	O
officially	O
discontinued	O
on	O
September	O
9	O
,	O
2014	O
following	O
the	O
announcement	O
of	O
the	O
iPhone	B-Operating_System
6	I-Operating_System
,	O
although	O
production	O
did	O
continue	O
for	O
developing	O
markets	O
until	O
February	O
17	O
,	O
2016	O
.	O
</s>
<s>
During	O
the	O
course	O
of	O
its	O
lifetime	O
,	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
was	O
one	O
of	O
the	O
best-selling	O
iPhones	B-Operating_System
ever	O
produced	O
and	O
it	O
is	O
the	O
first	O
iPhone	B-Operating_System
to	O
support	O
five	O
major	O
versions	O
of	O
iOS	B-Application
:	O
iOS	B-Operating_System
5	I-Operating_System
,	O
iOS	B-Operating_System
6	I-Operating_System
,	O
iOS	B-Operating_System
7	I-Operating_System
,	O
iOS	B-Operating_System
8	I-Operating_System
,	O
and	O
iOS	B-Operating_System
9	I-Operating_System
(	O
the	O
iPad	B-Operating_System
2	I-Operating_System
was	O
supported	O
from	O
iOS	B-Operating_System
4	I-Operating_System
to	O
iOS	B-Operating_System
9	I-Operating_System
)	O
.	O
</s>
<s>
The	O
4S	O
is	O
the	O
last	O
iPhone	B-Operating_System
to	O
have	O
Apple	O
’s	O
proprietary	O
30	O
pin	O
connector	O
,	O
as	O
the	O
succeeding	O
iPhone	B-Operating_System
5	I-Operating_System
replaced	O
it	O
with	O
the	O
all	O
digital	B-General_Concept
Lightning	B-Architecture
connector	I-Architecture
.	O
</s>
<s>
As	O
early	O
as	O
May	O
2011	O
,	O
some	O
leaks	O
had	O
a	O
fairly	O
accurate	O
description	O
of	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
including	O
the	O
name	O
""	O
,	O
the	O
Apple	O
A5	O
chip	O
,	O
HSDPA	O
,	O
new	O
camera	O
,	O
and	O
Sprint	O
carrying	O
.	O
</s>
<s>
The	O
was	O
unveiled	O
at	O
Apple	O
's	O
"	O
Let	O
's	O
Talk	O
iPhone	B-Operating_System
"	O
event	O
on	O
October	O
4	O
,	O
2011	O
,	O
on	O
the	O
Apple	O
Campus	O
in	O
Cupertino	O
,	O
California	O
.	O
</s>
<s>
At	O
the	O
"	O
Let	O
's	O
Talk	O
iPhone	B-Operating_System
"	O
event	O
held	O
by	O
Apple	O
on	O
October	O
4	O
,	O
2011	O
,	O
Mike	O
Capps	O
demonstrated	O
Epic	O
Games	O
 '	O
Infinity	B-Application
Blade	I-Application
II	I-Application
,	O
the	O
sequel	O
to	O
Infinity	B-Application
Blade	I-Application
,	O
on	O
an	O
.	O
</s>
<s>
Capps	O
boasted	O
that	O
the	O
game	O
uses	O
Epic	O
Games	O
 '	O
Unreal	O
Engine	O
3	O
and	O
features	O
the	O
same	O
graphic	O
techniques	O
used	O
in	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
game	O
Gears	B-Application
of	I-Application
War	I-Application
3	I-Application
.	O
</s>
<s>
Speculation	O
about	O
Apple	O
's	O
next	O
generation	B-Application
smartphone	B-Application
,	O
including	O
various	O
specifications	O
and	O
a	O
predicted	O
name	O
"	O
iPhone	B-Operating_System
5	I-Operating_System
"	O
,	O
had	O
been	O
widespread	O
in	O
the	O
time	O
preceding	O
its	O
debut	O
.	O
</s>
<s>
After	O
the	O
was	O
announced	O
,	O
it	O
was	O
considered	O
by	O
some	O
media	O
to	O
be	O
a	O
disappointment	O
,	O
due	O
to	O
the	O
expected	O
release	O
of	O
an	O
iPhone	B-Operating_System
5	I-Operating_System
.	O
</s>
<s>
There	O
were	O
no	O
external	O
differences	O
between	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
CDMA	B-Protocol
model	O
and	O
the	O
,	O
with	O
the	O
exception	O
of	O
a	O
SIM	O
card	O
slot	O
on	O
the	O
.	O
</s>
<s>
All	O
changes	O
were	O
internal	O
(	O
slight	O
external	O
differences	O
between	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
GSM	O
model	O
and	O
the	O
exist	O
,	O
as	O
said	O
differences	O
existed	O
between	O
the	O
CDMA	B-Protocol
and	O
GSM	O
models	O
of	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
)	O
.	O
</s>
<s>
On	O
September	O
10	O
,	O
2013	O
,	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
name	O
was	O
re-stylised	O
as	O
iPhone	B-Operating_System
4s	I-Operating_System
,	O
using	O
a	O
lower	O
case	O
'	O
s	O
 '	O
to	O
reflect	O
the	O
names	O
of	O
the	O
newly	O
announced	O
iPhone	B-Operating_System
5s	I-Operating_System
and	O
iPhone	B-Operating_System
5c	I-Operating_System
.	O
</s>
<s>
This	O
was	O
unusual	O
for	O
Apple	O
as	O
an	O
upper	O
case	O
'	O
S	O
 '	O
had	O
been	O
used	O
since	O
the	O
introduction	O
of	O
the	O
iPhone	B-Operating_System
3GS	I-Operating_System
in	O
2009	O
.	O
</s>
<s>
On	O
September	O
9	O
,	O
2014	O
,	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
was	O
officially	O
discontinued	O
following	O
the	O
reveal	O
of	O
iPhone	B-Operating_System
6	I-Operating_System
and	O
iPhone	B-Operating_System
6	I-Operating_System
Plus	I-Operating_System
.	O
</s>
<s>
On	O
September	O
13	O
,	O
2016	O
,	O
following	O
the	O
release	O
of	O
iOS	B-Operating_System
10	I-Operating_System
,	O
Apple	O
dropped	O
support	O
for	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
,	O
making	O
iOS	B-Operating_System
9	I-Operating_System
the	O
last	O
major	O
iOS	B-Application
version	O
available	O
for	O
the	O
device	O
.	O
</s>
<s>
The	O
,	O
like	O
other	O
iPhones	B-Operating_System
,	O
runs	O
iOS	B-Application
,	O
Apple	O
's	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
.	O
</s>
<s>
The	O
user	B-Application
interface	I-Application
of	O
iOS	B-Application
is	O
based	O
on	O
the	O
concept	O
of	O
direct	O
manipulation	O
,	O
using	O
multi-touch	B-Application
gestures	O
.	O
</s>
<s>
Interaction	O
with	O
the	O
OS	O
includes	O
gestures	O
such	O
as	O
swipe	O
,	O
tap	O
,	O
pinch	O
,	O
and	O
reverse	O
pinch	O
,	O
all	O
of	O
which	O
have	O
specific	O
definitions	O
within	O
the	O
context	O
of	O
the	O
iOS	B-Application
operating	O
system	O
and	O
its	O
multi-touch	B-Application
interface	O
.	O
</s>
<s>
Internal	O
accelerometers	O
are	O
used	O
by	O
some	O
applications	B-Application
to	O
respond	O
to	O
shaking	O
the	O
device	O
(	O
one	O
common	O
result	O
is	O
the	O
undo	O
command	O
)	O
or	O
rotating	O
it	O
in	O
three	O
dimensions	O
(	O
one	O
common	O
result	O
is	O
switching	O
from	O
portrait	O
to	O
landscape	O
mode	O
)	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
4S	I-Operating_System
was	O
first	O
shipped	O
with	O
iOS	B-Operating_System
5.0	I-Operating_System
,	O
which	O
was	O
released	O
on	O
October	O
12	O
,	O
2011	O
,	O
two	O
days	O
before	O
the	O
release	O
of	O
the	O
device	O
.	O
</s>
<s>
As	O
of	O
April	O
2021	O
,	O
the	O
device	O
can	O
be	O
updated	O
to	O
iOS	B-Operating_System
9	I-Operating_System
.	O
</s>
<s>
It	O
can	O
act	O
as	O
a	O
hotspot	B-Application
,	O
sharing	O
its	O
internet	O
connection	O
over	O
WiFi	O
,	O
Bluetooth	B-Protocol
,	O
or	O
USB	O
,	O
and	O
also	O
accesses	O
the	O
App	B-Application
Store	I-Application
,	O
a	O
digital	B-General_Concept
application	B-Application
distribution	O
platform	O
for	O
iOS	B-Application
developed	O
and	O
maintained	O
by	O
Apple	O
.	O
</s>
<s>
The	O
service	O
allows	O
users	O
to	O
browse	O
and	O
download	O
applications	B-Application
from	O
the	O
iTunes	O
Store	O
that	O
were	O
developed	O
with	O
Xcode	B-Operating_System
and	O
the	O
iOS	B-Operating_System
SDK	I-Operating_System
and	O
were	O
published	O
through	O
Apple	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
4S	I-Operating_System
can	O
play	O
music	O
,	O
movies	O
,	O
television	O
shows	O
,	O
ebooks	O
,	O
audiobooks	O
,	O
and	O
podcasts	B-Operating_System
and	O
can	O
sort	O
its	O
media	O
library	O
by	O
songs	O
,	O
artists	O
,	O
albums	O
,	O
videos	O
,	O
playlists	O
,	O
genres	O
,	O
composers	O
,	O
podcasts	B-Operating_System
,	O
audiobooks	O
,	O
and	O
compilations	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
4S	I-Operating_System
uses	O
a	O
large	O
font	O
that	O
allows	O
users	O
plenty	O
of	O
room	O
to	O
touch	O
their	O
selection	O
.	O
</s>
<s>
On	O
the	O
4S	O
,	O
the	O
volume	O
can	O
be	O
changed	O
with	O
the	O
included	O
Apple	O
Earphones	O
,	O
and	O
the	O
Voice	B-Application
Control	I-Application
feature	O
can	O
be	O
used	O
to	O
identify	O
a	O
track	O
,	O
play	O
songs	O
in	O
a	O
playlist	O
or	O
by	O
a	O
specific	O
artist	O
,	O
or	O
create	O
a	O
Genius	B-Operating_System
playlist	I-Operating_System
.	O
</s>
<s>
The	O
introduced	O
a	O
new	O
automated	O
voice	B-Application
control	I-Application
system	O
called	O
Siri	B-Application
,	O
that	O
allows	O
the	O
user	O
to	O
give	O
the	O
iPhone	B-Operating_System
commands	O
,	O
which	O
it	O
can	O
execute	O
and	O
respond	O
to	O
.	O
</s>
<s>
For	O
example	O
,	O
iPhone	B-Operating_System
commands	O
such	O
as	O
"	O
What	O
is	O
the	O
weather	O
going	O
to	O
be	O
like	O
?	O
"	O
</s>
<s>
These	O
commands	O
can	O
vary	O
greatly	O
and	O
control	O
almost	O
every	O
application	B-Application
of	O
the	O
smartphone	B-Application
.	O
</s>
<s>
The	O
commands	O
given	O
do	O
not	O
have	O
to	O
be	O
specific	O
and	O
can	O
be	O
used	O
with	O
natural	B-Language
language	I-Language
.	O
</s>
<s>
Siri	B-Application
can	O
be	O
accessed	O
by	O
holding	O
down	O
the	O
home	O
button	O
for	O
a	O
short	O
amount	O
of	O
time	O
(	O
compared	O
to	O
using	O
the	O
regular	O
function	O
)	O
.	O
</s>
<s>
An	O
impact	O
of	O
Siri	B-Application
,	O
as	O
shown	O
by	O
Apple	O
video	O
messages	O
,	O
is	O
that	O
it	O
is	O
much	O
easier	O
for	O
people	O
to	O
use	O
device	O
functions	O
while	O
driving	O
,	O
exercising	O
,	O
or	O
when	O
they	O
have	O
their	O
hands	O
full	O
.	O
</s>
<s>
It	O
also	O
means	O
people	O
with	O
trouble	O
reading	O
,	O
seeing	O
,	O
or	O
typing	O
can	O
access	O
the	O
smartphone	B-Application
more	O
easily	O
.	O
</s>
<s>
On	O
the	O
,	O
texting	O
can	O
be	O
aided	O
by	O
the	O
voice	B-Protocol
assistant	I-Protocol
,	O
which	O
allows	O
speech-to-text	O
.	O
</s>
<s>
In	O
addition	O
to	O
regular	O
texting	O
,	O
messaging	O
on	O
the	O
is	O
supported	O
by	O
iMessage	O
,	O
a	O
specialized	O
instant	O
messaging	O
program	O
and	O
service	O
that	O
allows	O
unlimited	O
texting	O
to	O
other	O
Apple	O
iOS	B-Operating_System
5	I-Operating_System
products	O
.	O
</s>
<s>
Input	O
to	O
the	O
computer	O
comes	O
from	O
a	O
keyboard	O
displayed	O
on	O
the	O
multi-touch	B-Application
screen	O
or	O
by	O
voice-to-text	O
by	O
speaking	O
into	O
the	O
microphone	B-Algorithm
.	O
</s>
<s>
Language	O
support	O
is	O
related	O
to	O
the	O
iOS	B-Operating_System
5	I-Operating_System
operating	O
system	O
that	O
the	O
device	O
launched	O
with	O
,	O
although	O
not	O
always	O
.	O
</s>
<s>
The	O
Siri	B-Application
digital	B-General_Concept
assistant	O
supported	O
French	O
,	O
English	O
,	O
and	O
German	O
at	O
launch	O
.	O
</s>
<s>
Since	O
it	O
uses	O
a	O
software-based	O
keyboard	O
supported	O
by	O
the	O
multi-touch	B-Application
display	O
,	O
it	O
can	O
support	O
many	O
different	O
keyboard	O
layouts	O
without	O
having	O
to	O
change	O
physically	O
.	O
</s>
<s>
On	O
September	O
19	O
,	O
2012	O
,	O
iOS	B-Operating_System
6	I-Operating_System
was	O
released	O
to	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
among	O
other	O
compatible	O
iOS	B-Application
devices	O
as	O
an	O
over	O
the	O
air	O
(	O
OTA	O
)	O
upgrade	O
package	O
.	O
</s>
<s>
According	O
to	O
Apple	O
the	O
update	O
contained	O
200	O
new	O
features	O
and	O
tweaks	O
,	O
which	O
included	O
a	O
new	O
maps	O
app	O
,	O
dubbed	O
Apple	B-Application
Maps	I-Application
,	O
Facebook	B-Application
integration	O
and	O
Passbook	O
,	O
an	O
application	B-Application
that	O
allows	O
users	O
to	O
store	O
their	O
coupons	O
,	O
boarding	O
passes	O
,	O
and	O
tickets	O
digitally	O
.	O
</s>
<s>
On	O
September	O
18	O
,	O
2013	O
,	O
Apple	O
released	O
iOS	B-Operating_System
7	I-Operating_System
and	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
is	O
among	O
other	O
compatible	O
iOS	B-Application
devices	O
that	O
also	O
received	O
the	O
update	O
without	O
any	O
lagging	O
issues	O
compared	O
to	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
Although	O
the	O
device	O
improved	O
performance	O
over	O
iOS	B-Operating_System
7	I-Operating_System
,	O
some	O
newer	O
features	O
that	O
were	O
released	O
to	O
newer	O
models	O
such	O
as	O
AirDrop	O
and	O
CarPlay	O
were	O
not	O
supported	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
4S	I-Operating_System
can	O
also	O
run	O
iOS	B-Operating_System
8	I-Operating_System
,	O
which	O
was	O
released	O
on	O
September	O
17	O
,	O
2014	O
.	O
</s>
<s>
In	O
fact	O
,	O
some	O
users	O
often	O
reported	O
that	O
performance	O
on	O
the	O
4S	O
is	O
very	O
slow	O
,	O
similar	O
to	O
how	O
iOS	B-Operating_System
7	I-Operating_System
ran	O
on	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
,	O
and	O
suggesting	O
that	O
they	O
should	O
not	O
upgrade	O
due	O
to	O
battery	O
draining	O
issues	O
and	O
hanging	O
up	O
on	O
calls	O
.	O
</s>
<s>
Meanwhile	O
,	O
Apple	O
released	O
iOS	B-Operating_System
8.1.1	I-Operating_System
,	O
which	O
brought	O
slight	O
improvements	O
to	O
the	O
phone	O
and	O
the	O
iPad	B-Operating_System
2	I-Operating_System
,	O
but	O
it	O
still	O
did	O
not	O
run	O
so	O
fast	O
as	O
newer	O
models	O
.	O
</s>
<s>
On	O
June	O
8	O
,	O
2015	O
,	O
Apple	O
announced	O
at	O
the	O
WWDC	O
that	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
would	O
support	O
iOS	B-Operating_System
9	I-Operating_System
.	O
</s>
<s>
This	O
makes	O
it	O
the	O
first	O
iPhone	B-Operating_System
to	O
support	O
five	O
major	O
versions	O
of	O
iOS	B-Application
,	O
and	O
the	O
second	O
iOS	B-Application
device	O
to	O
support	O
five	O
major	O
versions	O
(	O
iOS	B-Operating_System
9	I-Operating_System
will	O
support	O
the	O
iPad	B-Operating_System
2	I-Operating_System
as	O
well	O
,	O
bringing	O
its	O
total	O
up	O
to	O
six	O
major	O
versions	O
of	O
iOS	B-Application
supported	O
)	O
.	O
</s>
<s>
On	O
December	O
22	O
,	O
2015	O
,	O
Apple	O
faced	O
a	O
class	O
action	O
lawsuit	O
for	O
crippling	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
with	O
the	O
iOS	B-Operating_System
9	I-Operating_System
update	O
with	O
slow	O
and	O
buggy	O
software	O
to	O
force	O
users	O
to	O
buy	O
a	O
new	O
iPhone	B-Operating_System
.	O
</s>
<s>
On	O
June	O
13	O
,	O
2016	O
,	O
Apple	O
announced	O
that	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
would	O
not	O
support	O
iOS	B-Operating_System
10	I-Operating_System
due	O
to	O
hardware	O
limitations	O
.	O
</s>
<s>
It	O
was	O
briefly	O
possible	O
to	O
downgrade	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
from	O
iOS	B-Operating_System
9	I-Operating_System
to	O
iOS	O
6.1.3	O
following	O
a	O
signing	O
window	O
,	O
which	O
opened	O
in	O
January	O
2018	O
and	O
closed	O
in	O
November	O
2019	O
.	O
</s>
<s>
The	O
option	O
to	O
downgrade	O
to	O
iOS	O
6.1.3	O
also	O
allowed	O
an	O
over-the-air	O
update	O
to	O
iOS	B-Operating_System
8.4.1	I-Operating_System
due	O
to	O
technical	O
limitations	O
preventing	O
a	O
direct	O
update	O
from	O
iOS	B-Operating_System
6	I-Operating_System
to	O
iOS	B-Operating_System
9	I-Operating_System
.	O
</s>
<s>
On	O
July	O
22	O
,	O
2019	O
,	O
Apple	O
released	O
iOS	O
9.3.6	O
for	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
to	O
fix	O
issues	O
caused	O
by	O
the	O
GPS	O
week	O
number	O
rollover	O
.	O
</s>
<s>
The	O
issues	O
would	O
impact	O
the	O
accuracy	O
of	O
GPS	O
location	O
and	O
set	O
the	O
device	O
's	O
date	O
and	O
time	O
to	O
an	O
incorrect	O
value	O
,	O
preventing	O
connection	O
to	O
HTTPS	B-Protocol
servers	O
and	O
,	O
consequently	O
,	O
Apple	O
's	O
servers	O
for	O
activation	O
,	O
iCloud	B-Application
and	O
the	O
iTunes	O
and	O
App	B-Application
stores	I-Application
.	O
</s>
<s>
The	O
uses	O
the	O
Apple	O
A5	O
system-on-chip	B-Architecture
(	O
SoC	O
)	O
,	O
also	O
found	O
in	O
the	O
iPad	B-Device
Mini	I-Device
(	O
1st	O
generation	B-Application
)	O
,	O
that	O
incorporates	O
an	O
Imagination	O
Technologies	O
PowerVR	B-Device
SGX543	O
graphics	B-Architecture
processing	I-Architecture
unit	I-Architecture
(	O
GPU	B-Architecture
)	O
.	O
</s>
<s>
This	O
GPU	B-Architecture
features	O
pixel	B-Algorithm
,	O
vertex	O
,	O
and	O
geometry	O
shader	O
hardware	O
supporting	O
OpenGL	B-Application
ES	I-Application
2.0	O
.	O
</s>
<s>
The	O
SGX543	O
is	O
an	O
improved	O
version	O
of	O
the	O
GPU	B-Architecture
used	O
in	O
the	O
predecessor	O
,	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
The	O
uses	O
a	O
dual-core	B-Architecture
model	O
that	O
is	O
integrated	O
with	O
the	O
Apple	O
A5	O
SoC	O
in	O
the	O
same	O
way	O
as	O
the	O
iPad	B-Operating_System
2	I-Operating_System
.	O
</s>
<s>
Apple	O
claims	O
that	O
the	O
has	O
up	O
to	O
seven	O
times	O
faster	O
graphics	O
than	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
;	O
this	O
was	O
corroborated	O
by	O
Epic	O
Games	O
president	O
Mike	O
Capps	O
.	O
</s>
<s>
In	O
September	O
2013	O
Apple	O
released	O
an	O
iPhone	B-Operating_System
4S	I-Operating_System
for	O
free	O
with	O
a	O
two-year	O
contract	O
and	O
but	O
with	O
only	O
8GB	O
of	O
storage	O
.	O
</s>
<s>
The	O
screen	O
is	O
the	O
same	O
as	O
the	O
prior	O
generation	B-Application
iPhones	B-Operating_System
;	O
,	O
640×960	O
resolution	B-Algorithm
(	O
Apple	O
's	O
"	O
retina	O
"	O
design	O
)	O
.	O
</s>
<s>
There	O
was	O
an	O
improvement	O
in	O
interactive	O
multimedia	O
applications	B-Application
compared	O
to	O
its	O
predecessor	O
.	O
</s>
<s>
The	O
has	O
an	O
improved	O
cellular	O
(	O
GSM	O
)	O
antenna	O
design	O
over	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
The	O
new	O
antenna	O
is	O
divided	O
up	O
into	O
two	O
pieces	O
within	O
the	O
stainless	O
steel	O
band	O
that	O
wraps	O
around	O
the	O
sides	O
of	O
the	O
smartphone	B-Application
.	O
</s>
<s>
As	O
a	O
result	O
of	O
an	O
upgraded	O
radio	O
chip	O
inside	O
it	O
,	O
in	O
addition	O
to	O
being	O
a	O
world	O
phone	O
,	O
both	O
GSM	O
and	O
CDMA	B-Protocol
customers	O
can	O
roam	O
internationally	O
on	O
GSM	O
networks	O
.	O
</s>
<s>
It	O
also	O
supports	O
Bluetooth	B-Protocol
4.0	O
.	O
</s>
<s>
The	O
camera	O
on	O
the	O
,	O
also	O
known	O
as	O
an	O
iSight	B-Protocol
camera	I-Protocol
,	O
can	O
take	O
8-megapixel	O
photographs	O
(	O
3,264	O
by	O
2,448	O
pixels	O
)	O
and	O
record	O
1080p	O
videos	O
at	O
up	O
to	O
30frames	O
per	O
second	O
with	O
upgraded	O
quality	O
(	O
30%	O
better	O
clarity	O
,	O
26%	O
better	O
white	O
balance	O
,	O
color	O
accuracy	O
)	O
due	O
to	O
an	O
additional	O
lens	O
,	O
IR	O
filter	O
,	O
a	O
wider	O
f/2.4	O
aperture	O
,	O
and	O
Image	O
signal	O
processor	O
(	O
built-in	O
A5	O
)	O
.	O
</s>
<s>
The	O
built-in	O
gyroscope	B-Application
allows	O
for	O
some	O
image	O
stabilization	O
for	O
the	O
camera	O
while	O
recording	O
video	O
,	O
although	O
it	O
still	O
has	O
room	O
for	O
improvement	O
,	O
since	O
state-of-the-art	O
image	O
stabilization	O
algorithms	O
do	O
not	O
need	O
to	O
use	O
a	O
gyroscope	B-Application
,	O
but	O
use	O
image	O
processing	O
.	O
</s>
<s>
The	O
features	O
a	O
960	O
by	O
640pixel	O
multitouch	B-Application
Retina	B-Operating_System
display	I-Operating_System
.	O
</s>
<s>
On	O
the	O
top	O
left	O
there	O
is	O
a	O
3.5mm	O
headphone	B-Device
jack	I-Device
and	O
a	O
microphone	B-Algorithm
that	O
is	O
used	O
for	O
both	O
noise	O
cancellation	O
during	O
calls	O
and	O
when	O
in	O
speakerphone/FaceTime	O
(	O
video	O
calling	O
)	O
mode	O
.	O
</s>
<s>
The	O
bottom	O
of	O
the	O
device	O
features	O
a	O
speaker	O
output	O
on	O
the	O
right	O
and	O
a	O
microphone	B-Algorithm
input	O
on	O
the	O
left	O
with	O
the	O
Apple	O
proprietary	O
30-pin	O
dock	O
connector	O
in	O
the	O
center	O
.	O
</s>
<s>
Supported	O
video	O
formats	O
include	O
H.264	O
(	O
1080p	O
30	O
frames	O
per	O
second	O
maximum	O
)	O
,	O
MPEG-4	O
video	O
,	O
and	O
motion	B-Application
JPEG	I-Application
(	O
M-JPEG	B-Application
)	O
.	O
</s>
<s>
In	O
addition	O
to	O
user	O
inputs	O
,	O
the	O
device	O
also	O
has	O
several	O
sensors	O
that	O
give	O
the	O
smartphone	B-Application
information	O
about	O
its	O
orientation	O
and	O
external	O
conditions	O
.	O
</s>
<s>
These	O
include	O
a	O
three-axis	O
gyroscope	B-Application
,	O
an	O
accelerometer	O
,	O
a	O
proximity	B-Device
sensor	I-Device
,	O
and	O
an	O
ambient	O
light	O
sensor	O
.	O
</s>
<s>
The	O
claimed	O
to	O
have	O
200hours	O
standby	O
time	O
,	O
8hours	O
talk	O
time	O
on	O
3G	B-Architecture
,	O
14hours	O
talk	O
time	O
on	O
2G	O
,	O
6hours	O
3G	B-Architecture
browsing	O
,	O
and	O
9hours	O
Wi-Fi	O
browsing	O
.	O
</s>
<s>
The	O
has	O
a	O
stainless	O
steel	O
,	O
dual	O
cellular	O
antenna	O
design	O
,	O
identical	O
to	O
iPhone	B-Operating_System
4	I-Operating_System
CDMA	B-Protocol
.	O
</s>
<s>
Apple	O
redesigned	O
the	O
antenna	O
in	O
the	O
CDMA	B-Protocol
after	O
some	O
original	O
iPhone	B-Operating_System
4	I-Operating_System
users	O
reported	O
cellular	O
signal	O
attenuation	O
problems	O
as	O
a	O
result	O
of	O
holding	O
it	O
in	O
certain	O
positions	O
.	O
</s>
<s>
The	O
improved	O
cellular	O
radio	O
in	O
the	O
smartphone	B-Application
can	O
switch	O
between	O
two	O
antennas	O
,	O
depending	O
on	O
which	O
is	O
sending/receiving	O
the	O
best	O
signal	O
.	O
</s>
<s>
The	O
bands	O
on	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
are	O
divided	O
into	O
two	O
antennas	O
:	O
cellular	O
and	O
Global	O
Positioning	O
System	O
GPS	O
,	O
with	O
Bluetooth	B-Protocol
and	O
Wi-Fi	O
reliant	O
on	O
an	O
internal	O
antenna	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
4	I-Operating_System
and	O
4S	O
were	O
designed	O
by	O
Jonathan	O
Ive	O
.	O
</s>
<s>
The	O
'	O
4	O
 '	O
generation	B-Application
iPhones	B-Operating_System
differ	O
from	O
earlier	O
Apple	O
designs	O
;	O
the	O
bulges	O
of	O
the	O
back	O
panel	O
as	O
well	O
as	O
the	O
band	O
between	O
the	O
front	O
and	O
back	O
are	O
gone	O
and	O
have	O
been	O
replaced	O
with	O
flattened	O
surfaces	O
.	O
</s>
<s>
The	O
redesign	O
reflects	O
the	O
utilitarianism	O
and	O
uniformity	O
of	O
existing	O
Apple	O
products	O
,	O
such	O
as	O
the	O
iPad	B-Device
and	O
the	O
iMac	B-Device
.	O
</s>
<s>
The	O
overall	O
dimensions	O
of	O
the	O
are	O
lower	O
than	O
that	O
of	O
the	O
3GS	B-Architecture
.	O
</s>
<s>
It	O
is	O
high	O
,	O
wide	O
,	O
and	O
deep	O
,	O
compared	O
to	O
the	O
iPhone	B-Operating_System
3GS	I-Operating_System
,	O
which	O
is	O
high	O
,	O
wide	O
,	O
and	O
deep	O
;	O
making	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
and	O
4S	O
21.5	O
%	O
thinner	O
than	O
the	O
3GS	B-Architecture
.	O
</s>
<s>
Reviewers	O
noted	O
Siri	B-Application
,	O
the	O
new	O
camera	O
,	O
and	O
processing	O
speeds	O
as	O
significant	O
advantages	O
over	O
the	O
prior	O
model	O
.	O
</s>
<s>
Tim	O
Stevens	O
of	O
Engadget	B-Application
said	O
that	O
the	O
"	O
does	O
everything	O
better	O
than	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
,	O
but	O
it	O
simply	O
does	O
n't	O
do	O
anything	O
substantially	O
different.	O
"	O
</s>
<s>
Joshua	O
Topolsky	O
of	O
The	O
Verge	O
stated	O
that	O
"	O
if	O
this	O
were	O
to	O
be	O
a	O
car	O
,	O
it	O
would	O
be	O
a	O
Mercedes	O
"	O
and	O
that	O
Siri	B-Application
is	O
"	O
probably	O
one	O
of	O
the	O
most	O
novel	O
applications	B-Application
Apple	O
has	O
ever	O
produced.	O
"	O
</s>
<s>
Most	O
reviewers	O
thought	O
that	O
Siri	B-Application
was	O
the	O
most	O
important	O
feature	O
on	O
the	O
.	O
</s>
<s>
Brian	O
Chen	O
of	O
Wired	O
said	O
that	O
"	O
the	O
fifth-generation	O
iPhone	B-Operating_System
's	O
superb	O
camera	O
and	O
speedy	O
dual-core	B-Architecture
processor	I-Architecture
are	O
classy	O
additions	O
.	O
</s>
<s>
But	O
Siri	B-Application
is	O
the	O
reason	O
people	O
should	O
buy	O
this	O
phone.	O
"	O
</s>
<s>
Retrevo	O
surveyed	O
more	O
than	O
1,300	O
U.S.	O
consumers	O
and	O
reported	O
that	O
71	O
percent	O
of	O
all	O
smartphone	B-Application
owners	O
were	O
not	O
disappointed	O
by	O
the	O
new	O
,	O
but	O
47	O
percent	O
or	O
almost	O
a	O
half	O
of	O
current	O
iPhone	B-Operating_System
4	I-Operating_System
owners	O
were	O
;	O
12	O
percent	O
were	O
hoping	O
for	O
a	O
bigger	O
display	O
,	O
21	O
percent	O
wanted	O
a	O
refreshed	O
design	O
,	O
and	O
29	O
percent	O
desired	O
4G	B-Architecture
.	O
</s>
<s>
Echoing	O
technology	O
pundits	O
,	O
Reuters	O
suggested	O
that	O
the	O
lack	O
of	O
a	O
more	O
radical	O
departure	O
from	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
could	O
open	O
new	O
market	O
opportunities	O
for	O
rivals	O
.	O
</s>
<s>
Analyst	O
C	O
.	O
K	O
.	O
Lu	O
of	O
Gartner	O
believed	O
that	O
Apple	O
no	O
longer	O
had	O
the	O
leading	O
edge	O
and	O
that	O
the	O
4S	O
would	O
only	O
sell	O
due	O
to	O
brand	O
loyalty	O
,	O
as	O
fans	O
had	O
been	O
expecting	O
an	O
iPhone	B-Operating_System
5	I-Operating_System
with	O
a	O
thinner	O
profile	O
,	O
edge-to-edge	O
screen	O
,	O
and	O
stronger	O
features	O
.	O
</s>
<s>
These	O
same	O
fans	O
had	O
also	O
wanted	O
a	O
cheaper	O
,	O
stripped-down	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
Gaming	O
on	O
the	O
has	O
been	O
likened	O
to	O
the	O
PlayStation	B-Device
Vita	I-Device
,	O
that	O
features	O
the	O
same	O
SGX	O
GPU	B-Architecture
only	O
in	O
a	O
quad-core	B-Architecture
configuration	O
,	O
and	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
handheld	B-Application
game	I-Application
consoles	I-Application
.	O
</s>
<s>
Further	O
,	O
the	O
'	O
ability	O
to	O
process	O
80	O
million	O
polygons	B-General_Concept
per	O
second	O
has	O
been	O
compared	O
to	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
home	O
video	B-Device
game	I-Device
consoles	I-Device
that	O
can	O
process	O
275	O
million	O
and	O
500	O
million	O
polygons	B-General_Concept
per	O
second	O
respectively	O
.	O
</s>
<s>
Computer	O
and	O
Video	O
Games	O
's	O
(	O
CVG	O
)	O
deputy	O
editor	O
Andy	O
Robinson	O
told	O
TechRadar	O
that	O
the	O
"	O
4S	O
is	O
certainly	O
laying	O
down	O
some	O
serious	O
credibility	O
for	O
the	O
iPhone	B-Operating_System
as	O
a	O
core	O
gaming	O
device	O
.	O
</s>
<s>
Not	O
only	O
is	O
it	O
now	O
pushing	O
out	O
games	O
that	O
simply	O
eclipse	O
the	O
3DS	B-Operating_System
visually	O
,	O
but	O
features	O
like	O
cloud	O
saving	O
and	O
TV	O
streaming	O
support	O
are	O
really	O
exciting	O
for	O
gamers.	O
"	O
</s>
<s>
The	O
senior	O
gaming	O
analyst	O
at	O
Jon	O
Peddie	O
Research	O
,	O
Ted	O
Pollak	O
,	O
believes	O
the	O
biggest	O
improvement	O
to	O
gaming	O
on	O
the	O
is	O
the	O
voice	B-Application
control	I-Application
features	O
,	O
noting	O
that	O
"	O
one	O
of	O
the	O
features	O
that	O
Nintendogs	B-Application
players	O
loved	O
was	O
the	O
ability	O
to	O
talk	O
to	O
it	O
.	O
</s>
<s>
There	O
's	O
no	O
reason	O
why	O
a	O
game	O
like	O
that	O
could	O
n't	O
be	O
done	O
on	O
the	O
,	O
and	O
much	O
more	O
sophisticated	O
given	O
the	O
voice	B-Application
control	I-Application
shown.	O
"	O
</s>
<s>
In	O
2012	O
,	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
won	O
the	O
T3	O
"	O
Work	O
Gadget	O
of	O
the	O
Year	O
"	O
award	O
,	O
beating	O
RIM	O
's	O
Blackberry	O
Bold	O
9900	O
,	O
rival	O
Samsung	B-Application
's	O
Galaxy	B-Application
Note	I-Application
amongst	O
others	O
.	O
</s>
<s>
Since	O
the	O
introduction	O
of	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
,	O
there	O
have	O
been	O
several	O
issues	O
reported	O
by	O
users	O
on	O
internet	O
forums	O
that	O
have	O
been	O
noted	O
by	O
media	O
organizations	O
such	O
as	O
CNN	B-Architecture
,	O
Boy	O
Genius	B-Operating_System
Report	O
,	O
The	O
Guardian	O
,	O
and	O
PC	O
World	O
.	O
</s>
<s>
Not	O
understanding	O
the	O
accent	O
of	O
users	O
from	O
various	O
countries	O
while	O
speaking	O
to	O
Siri	B-Application
.	O
</s>
<s>
Bluetooth	B-Protocol
connectivity	O
and	O
range	O
sometimes	O
poor	O
,	O
deficient	O
,	O
and/or	O
defective	O
.	O
</s>
<s>
The	O
sound	O
quality	O
on	O
the	O
other	O
end	O
is	O
muffled	O
and/or	O
undiscernible	O
,	O
with	O
reports	O
indicating	O
the	O
iPhone	B-Operating_System
is	O
likely	O
the	O
problem	O
as	O
opposed	O
to	O
the	O
Bluetooth	B-Protocol
headsets	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
4S	I-Operating_System
had	O
an	O
issue	O
where	O
the	O
Wi-Fi	O
toggles	O
would	O
appear	O
greyed	O
out	O
in	O
both	O
Settings	O
and	O
the	O
Control	O
Center	O
,	O
which	O
was	O
mainly	O
caused	O
by	O
thermal	O
shock	O
of	O
the	O
Wi-Fi	O
antenna	O
.	O
</s>
<s>
Unlike	O
prior	O
iPhone	B-Operating_System
models	O
,	O
the	O
number	O
of	O
sales	O
of	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
had	O
not	O
yet	O
climaxed	O
before	O
the	O
introduction	O
of	O
the	O
4S	O
.	O
</s>
<s>
Previous	O
iPhone	B-Operating_System
models	O
were	O
released	O
during	O
or	O
after	O
declining	O
sales	O
figures	O
.	O
</s>
<s>
In	O
addition	O
,	O
iPhone	B-Operating_System
4	I-Operating_System
users	O
had	O
high	O
marks	O
for	O
being	O
satisfied	O
with	O
their	O
smartphones	B-Application
.	O
</s>
<s>
Upon	O
the	O
announcement	O
of	O
the	O
,	O
shares	O
of	O
Samsung	B-Application
Electronics	O
,	O
HTC	O
and	O
Nokia	O
gained	O
on	O
Wednesday	O
after	O
the	O
4S	O
was	O
announced	O
,	O
while	O
Apple	O
stock	O
fell	O
.	O
</s>
<s>
On	O
October	O
10	O
,	O
Apple	O
announced	O
that	O
more	O
than	O
one	O
million	O
orders	O
for	O
the	O
had	O
been	O
received	O
within	O
the	O
first	O
24	O
hours	O
of	O
it	O
being	O
on	O
sale	O
,	O
beating	O
the	O
600,000	O
device	O
record	O
set	O
by	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
The	O
16-month	O
wait	O
between	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
and	O
4S	O
may	O
have	O
contributed	O
to	O
overwhelming	O
sales	O
as	O
well	O
.	O
</s>
<s>
On	O
October	O
17	O
,	O
2011	O
,	O
Apple	O
had	O
announced	O
that	O
four	O
million	O
units	O
of	O
the	O
were	O
sold	O
in	O
the	O
first	O
three	O
days	O
of	O
release	O
,	O
and	O
25million	O
iOS	B-Application
users	O
had	O
upgraded	O
to	O
the	O
then	O
latest	O
version	O
of	O
iOS	B-Application
,	O
iOS	B-Operating_System
5	I-Operating_System
,	O
which	O
was	O
released	O
upon	O
the	O
introduction	O
of	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
.	O
</s>
<s>
Phil	O
Schiller	O
,	O
Apple	O
's	O
senior	O
vice	O
president	O
of	O
Worldwide	O
Product	O
Marketing	O
,	O
stated	O
that	O
the	O
"	O
is	O
off	O
to	O
a	O
great	O
start	O
with	O
more	O
than	O
four	O
million	O
sold	O
in	O
its	O
first	O
weekend	O
—	O
the	O
most	O
ever	O
for	O
a	O
phone	O
and	O
more	O
than	O
double	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
launch	O
during	O
its	O
first	O
three	O
days.	O
"	O
</s>
<s>
The	O
used	O
smartphone	B-Application
market	O
saw	O
unprecedented	O
rates	O
of	O
trade-ins	O
in	O
the	O
weeks	O
leading	O
up	O
to	O
the	O
4S	O
announcement	O
,	O
and	O
after	O
it	O
,	O
there	O
was	O
a	O
drop	O
in	O
prices	O
offered	O
.	O
</s>
<s>
Previous	O
generation	B-Application
iPhones	B-Operating_System
are	O
recirculated	O
through	O
the	O
markets	O
via	O
various	O
methods	O
and	O
third-party	O
buyers	O
may	O
purchase	O
older	O
generation	B-Application
iPhones	B-Operating_System
.	O
</s>
<s>
Apple	O
also	O
buys	O
back	O
previous	O
generation	B-Application
iPhones	B-Operating_System
under	O
a	O
special	O
program	O
.	O
</s>
<s>
On	O
April	O
24	O
,	O
2012	O
,	O
AT&T	O
announced	O
that	O
7.6	O
million	O
iPhone	B-Operating_System
units	O
were	O
activated	O
in	O
Q4	O
2011	O
,	O
and	O
4.3	O
million	O
in	O
Q1	O
2012	O
.	O
</s>
<s>
In	O
total	O
,	O
AT&T	O
sold	O
5.5	O
million	O
smartphones	B-Application
in	O
the	O
first	O
quarter	O
of	O
2012	O
,	O
out	O
of	O
which	O
78%	O
were	O
iPhones	B-Operating_System
.	O
</s>
