<s>
The	O
iPhone	B-Operating_System
(	O
retroactively	O
referred	O
to	O
as	O
the	O
iPhone	B-Operating_System
2G	I-Operating_System
,	O
iPhone	B-Operating_System
1	I-Operating_System
,	O
or	O
original	B-Operating_System
iPhone	I-Operating_System
)	O
is	O
the	O
first	O
iPhone	B-Operating_System
model	O
and	O
the	O
first	O
smartphone	B-Application
designed	O
and	O
marketed	O
by	O
Apple	O
Inc	O
.	O
After	O
years	O
of	O
rumors	O
and	O
speculation	O
,	O
it	O
was	O
officially	O
announced	O
on	O
January	O
9	O
,	O
2007	O
,	O
and	O
it	O
was	O
released	O
in	O
the	O
United	O
States	O
on	O
June	O
29	O
,	O
2007	O
.	O
</s>
<s>
Development	B-Application
of	I-Application
the	I-Application
iPhone	I-Application
as	O
a	O
product	O
began	O
in	O
2005	O
and	O
continued	O
in	O
complete	O
secrecy	O
until	O
its	O
public	O
unveiling	O
.	O
</s>
<s>
The	O
device	O
broke	O
with	O
prevailing	O
mobile	O
phone	O
designs	O
by	O
eliminating	O
most	O
physical	O
hardware	O
buttons	O
and	O
eschewing	O
a	O
stylus	O
for	O
its	O
finger-friendly	O
touch	O
interface	O
,	O
featuring	O
instead	O
only	O
a	O
few	O
physical	O
buttons	O
and	O
a	O
touch	B-Device
screen	I-Device
.	O
</s>
<s>
It	O
featured	O
quad-band	O
GSM	O
cellular	O
connectivity	O
with	O
GPRS	B-General_Concept
and	O
EDGE	O
support	O
for	O
data	O
transfer	O
,	O
and	O
it	O
used	O
continuous	O
internet	O
access	O
and	O
onboard	O
processing	O
to	O
support	O
features	O
unrelated	O
to	O
voice	O
communication	O
.	O
</s>
<s>
Its	O
successor	O
,	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
,	O
was	O
announced	O
on	O
June	O
9	O
,	O
2008	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
quickly	O
became	O
Apple	O
's	O
most	O
successful	O
product	O
,	O
with	O
later	O
generations	O
propelling	O
it	O
to	O
become	O
the	O
most	O
profitable	O
company	O
at	O
the	O
time	O
.	O
</s>
<s>
The	O
introduction	O
of	O
the	O
App	B-Application
Store	I-Application
allowed	O
established	O
companies	O
and	O
startup	O
developers	O
to	O
build	O
careers	O
and	O
earn	O
billions	O
of	O
dollars	O
,	O
via	O
the	O
platform	O
,	O
while	O
providing	O
consumers	O
with	O
new	O
ways	O
to	O
access	O
information	O
and	O
connect	O
with	O
other	O
people	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
largely	O
appealed	O
to	O
the	O
general	O
public	O
,	O
as	O
opposed	O
to	O
the	O
business	O
community	O
BlackBerry	B-Operating_System
and	O
IBM	O
focused	O
on	O
at	O
the	O
time	O
,	O
and	O
,	O
by	O
integrating	O
existing	O
technology	O
and	O
expanding	O
on	O
usability	O
,	O
the	O
iPhone	B-Operating_System
turned	O
the	O
smartphone	B-Application
industry	O
"	O
on	O
its	O
head	O
"	O
.	O
</s>
<s>
In	O
1999	O
,	O
Apple	O
CEO	O
Steve	O
Jobs	O
envisioned	O
an	O
Apple	O
touchscreen	B-Device
product	O
that	O
the	O
user	O
could	O
interact	O
with	O
directly	O
with	O
their	O
fingers	O
rather	O
than	O
using	O
a	O
stylus	O
.	O
</s>
<s>
The	O
stylus	O
was	O
a	O
common	O
tool	O
for	O
many	O
existing	O
touchscreen	B-Device
devices	O
at	O
the	O
time	O
including	O
Apple	O
's	O
own	O
Newton	B-Device
,	O
launched	O
in	O
1993	O
.	O
</s>
<s>
He	O
decided	O
that	O
the	O
device	O
would	O
require	O
a	O
triple	O
layered	O
capacitive	O
multi-touch	B-Application
touch	B-Device
screen	I-Device
,	O
a	O
very	O
new	O
and	O
advanced	O
technology	O
at	O
the	O
time	O
.	O
</s>
<s>
This	O
helped	O
with	O
removing	O
the	O
physical	O
keyboard	B-Device
and	O
mouse	B-Device
,	O
the	O
same	O
as	O
was	O
common	O
at	O
the	O
time	O
for	O
tablet	B-Device
computers	I-Device
,	O
human	B-Application
machine	I-Application
interfaces	I-Application
and	O
point	O
of	O
sale	O
systems	O
.	O
</s>
<s>
When	O
Jobs	O
reviewed	O
the	O
prototype	O
and	O
its	O
user	B-Application
interface	I-Application
,	O
he	O
saw	O
the	O
potential	O
in	O
developing	O
the	O
concept	O
into	O
a	O
mobile	O
phone	O
to	O
compete	O
with	O
already	O
established	O
brands	O
in	O
the	O
then	O
emerging	O
market	O
for	O
touch	B-Device
screen	I-Device
phones	O
.	O
</s>
<s>
The	O
whole	O
effort	O
was	O
called	O
Project	O
Purple	O
2	B-Operating_System
and	O
began	O
in	O
2005	O
.	O
</s>
<s>
Apple	O
purchased	O
the	O
"	O
iphone.org	O
 "	O
domain	O
in	O
December	O
1999	O
.	O
</s>
<s>
Instead	O
,	O
Cingular	O
Wireless	O
gave	O
Apple	O
the	O
liberty	O
to	O
develop	O
the	O
iPhone	B-Operating_System
's	O
hardware	O
and	O
software	O
in-house	B-Architecture
.	O
</s>
<s>
The	O
original	B-Operating_System
iPhone	I-Operating_System
was	O
introduced	O
by	O
Steve	O
Jobs	O
on	O
January	O
9	O
,	O
2007	O
in	O
a	O
keynote	O
address	O
at	O
the	O
Macworld	O
Conference	O
&	O
Expo	O
held	O
in	O
Moscone	O
West	O
in	O
San	O
Francisco	O
,	O
California	O
.	O
</s>
<s>
Jobs	O
introduced	O
the	O
iPhone	B-Operating_System
as	O
a	O
combination	O
of	O
three	O
devices	O
:	O
a	O
"	O
widescreen	O
iPod	B-Device
with	O
touch	O
controls	O
"	O
;	O
a	O
"	O
revolutionary	O
mobile	O
phone	O
"	O
;	O
and	O
a	O
"	O
breakthrough	O
Internet	O
communicator	O
"	O
.	O
</s>
<s>
Six	O
weeks	O
prior	O
to	O
the	O
iPhone	B-Operating_System
's	O
release	O
,	O
the	O
plastic	O
screen	O
was	O
replaced	O
with	O
glass	O
,	O
after	O
Jobs	O
was	O
upset	O
that	O
the	O
screen	O
of	O
the	O
prototype	O
he	O
was	O
carrying	O
in	O
his	O
pocket	O
had	O
been	O
scratched	O
by	O
his	O
keys	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
was	O
released	O
in	O
the	O
United	O
States	O
on	O
June	O
29	O
,	O
2007	O
at	O
the	O
price	O
of	O
$499	O
for	O
the	O
4GB	O
model	O
and	O
$599	O
for	O
the	O
8GB	O
model	O
,	O
both	O
requiring	O
a	O
2-year	O
contract	O
.	O
</s>
<s>
To	O
avoid	O
repeating	O
the	O
problems	O
of	O
the	O
PlayStation	O
3	B-Operating_System
launch	O
,	O
which	O
caused	O
burglaries	O
and	O
even	O
a	O
shooting	O
,	O
off-duty	O
police	O
officers	O
were	O
hired	O
to	O
guard	O
stores	O
overnight	O
.	O
</s>
<s>
Six	O
out	O
of	O
ten	O
Americans	O
surveyed	O
said	O
they	O
knew	O
before	O
its	O
release	O
that	O
the	O
iPhone	B-Operating_System
was	O
coming	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
's	O
main	O
competitors	O
in	O
both	O
consumer	O
and	O
business	O
markets	O
were	O
considered	O
to	O
be	O
the	O
LG	O
Prada	O
,	O
LG	O
Viewty	O
,	O
Samsung	B-Application
Ultra	O
Smart	O
F700	O
,	O
Nokia	B-Language
N95	I-Language
,	O
Nokia	O
E61i	O
,	O
Palm	O
Treo	O
750	O
,	O
Palm	B-Application
Centro	I-Application
,	O
HTC	O
Touch	O
,	O
Sony	B-Language
Ericsson	I-Language
W960	I-Language
,	O
Sony	O
Ericsson	O
C905	O
and	O
BlackBerry	B-Operating_System
.	O
</s>
<s>
The	B-Device
iPod	I-Device
Touch	O
,	O
a	O
touchscreen	B-Device
device	O
with	O
the	O
media	O
and	O
internet	O
abilities	O
and	O
interface	O
of	O
the	O
iPhone	B-Operating_System
but	O
without	O
the	O
ability	O
to	O
connect	O
to	O
a	O
cellular	O
network	O
for	O
phone	O
functions	O
or	O
internet	O
access	O
,	O
was	O
released	O
on	O
September	O
5	O
,	O
2007	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
Apple	O
significantly	O
dropped	O
the	O
price	O
of	O
the	O
8GB	O
model	O
(	O
from	O
$599	O
to	O
$399	O
,	O
still	O
requiring	O
a	O
2-year	O
contract	O
with	O
AT&T	O
)	O
while	O
discontinuing	O
the	O
4GB	O
model	O
.	O
</s>
<s>
Apple	O
sold	O
the	O
one	O
millionth	O
iPhone	B-Operating_System
five	O
days	O
later	O
,	O
or	O
74	O
days	O
after	O
the	O
release	O
.	O
</s>
<s>
Apple	O
released	O
an	O
SDK	B-Operating_System
on	O
March	O
6	O
,	O
2008	O
,	O
allowing	O
developers	O
to	O
create	O
the	O
apps	B-Application
that	O
would	O
be	O
available	O
starting	O
in	O
iPhone	B-Operating_System
OS	O
version	B-Operating_System
2.0	I-Operating_System
,	O
a	O
free	O
upgrade	O
for	O
iPhone	B-Operating_System
users	O
.	O
</s>
<s>
On	O
June	O
9	O
,	O
Apple	O
announced	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
,	O
which	O
began	O
shipping	O
July	O
11	O
.	O
</s>
<s>
The	O
original	B-Operating_System
iPhone	I-Operating_System
was	O
discontinued	O
on	O
July	O
15	O
;	O
total	O
sales	O
volume	O
came	O
to	O
6,124,000	O
units	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
's	O
back	O
cover	O
is	O
made	O
out	O
of	O
aluminum	O
,	O
a	O
soft	O
metal	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
's	O
screen	O
is	O
a	O
320x480	O
resolution	B-Algorithm
LCD	B-Device
screen	I-Device
at	O
163	O
ppi	B-Algorithm
that	O
measures	O
about	O
3.5	O
inches	O
diagonally	O
,	O
much	O
bigger	O
than	O
most	O
other	O
phones	O
at	O
the	O
time	O
,	O
and	O
the	O
iPhone	B-Operating_System
was	O
the	O
first	O
mobile	O
phone	O
with	O
multi-touch	B-Application
technology	I-Application
.	O
</s>
<s>
The	O
rear	O
camera	O
on	O
the	O
iPhone	B-Operating_System
has	O
a	O
resolution	B-Algorithm
of	O
2	B-Operating_System
megapixels	B-Algorithm
and	O
also	O
features	O
geotagging	B-Algorithm
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
has	O
four	O
total	O
buttons	O
and	O
a	O
single	O
switch	O
:	O
a	O
power	O
and	O
sleep	O
button	O
,	O
a	O
volume	O
up	O
and	O
volume	O
down	O
button	O
,	O
a	O
silent/ringer	O
switch	O
,	O
and	O
a	O
home	O
button	O
positioned	O
in	O
the	O
bottom	O
center	O
of	O
the	O
face	O
of	O
the	O
phone	O
.	O
</s>
<s>
The	O
home	O
button	O
,	O
when	O
pressed	O
,	O
would	O
send	O
the	O
user	O
back	O
to	O
the	O
home	B-Operating_System
screen	I-Operating_System
from	O
whatever	O
app	O
they	O
were	O
currently	O
using	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
featured	O
a	O
Samsung	B-Application
32-bit	O
ARM	B-Architecture
microprocessor	I-Architecture
,	O
underclocked	B-Device
from	O
its	O
stock	O
620	O
MHz	O
to	O
a	O
slower	O
412MHz	O
to	O
increase	O
battery	O
life	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
also	O
included	O
several	O
sets	O
of	O
sensors	O
,	O
including	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>
Similar	O
to	O
the	B-Device
iPod	I-Device
Touch	O
,	O
the	O
iPhone	B-Operating_System
also	O
featured	O
a	O
3.5	O
millimetre	O
auxiliary	O
headphone	O
jack	O
.	O
</s>
<s>
The	O
phone	O
also	O
had	O
a	O
3.7	O
V	O
1400	O
mAh	O
Lithium-ion	O
battery	O
built	O
in	O
it	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
its	O
unveiling	O
in	O
January	O
,	O
Steve	O
Jobs	O
claimed	O
:	O
"	O
iPhone	B-Operating_System
runs	O
OS	O
X	O
"	O
and	O
runs	O
"	O
desktop-class	O
applications	O
"	O
,	O
but	O
at	O
the	O
time	O
of	O
the	O
iPhone	B-Operating_System
's	O
release	O
,	O
the	O
operating	O
system	O
was	O
renamed	O
"	O
iPhone	B-Operating_System
OS	O
"	O
.	O
</s>
<s>
The	O
original	B-Operating_System
iPhone	I-Operating_System
supported	O
three	O
major	O
versions	O
of	O
the	O
operating	O
system	O
before	O
it	O
was	O
discontinued	O
:	O
iPhone	B-Operating_System
OS	I-Operating_System
1	I-Operating_System
,	O
2	B-Operating_System
,	O
and	O
3	B-Operating_System
.	O
</s>
<s>
The	O
last	O
update	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
received	O
was	O
iPhone	B-Operating_System
OS	I-Operating_System
3.1.3	I-Operating_System
,	O
as	O
iPhone	O
OS	O
3.2	O
was	O
intended	O
for	O
the	B-Operating_System
iPad	I-Operating_System
.	O
</s>
<s>
The	O
original	O
operating	O
system	O
for	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
,	O
iPhone	B-Operating_System
OS	I-Operating_System
1	I-Operating_System
,	O
featured	O
Visual	O
Voicemail	O
,	O
multi-touch	B-Application
gestures	O
,	O
HTML	B-Language
email	O
,	O
Apple	B-Application
's	I-Application
Safari	I-Application
web	O
browser	O
,	O
threaded	O
text	O
messaging	O
,	O
an	O
"	O
iPod	B-Device
"	O
music	O
and	O
video	O
player	O
app	O
,	O
a	O
dedicated	O
YouTube	B-General_Concept
app	I-General_Concept
and	O
a	O
Maps	O
app	O
powered	O
by	O
Google	B-Application
Maps	I-Application
.	I-Application
</s>
<s>
It	O
also	O
included	O
basic	O
Phone/contacts	O
,	O
Calendar	O
,	O
Photos	O
,	O
Stocks	O
,	O
Weather	O
,	O
Clock	O
,	O
Calculator	O
,	O
Notes	O
,	O
and	O
Settings	O
apps	B-Application
.	O
</s>
<s>
However	O
,	O
many	O
features	O
like	O
MMS	O
,	O
apps	B-Application
,	O
and	O
copy	B-General_Concept
and	I-General_Concept
paste	I-General_Concept
were	O
not	O
supported	O
at	O
release	O
,	O
leading	O
hackers	O
jailbreaking	B-Application
their	O
phones	O
to	O
add	O
these	O
features	O
.	O
</s>
<s>
A	O
v1.1	O
update	O
alongside	O
the	O
introduction	O
of	O
the	B-Device
iPod	I-Device
Touch	O
in	O
September	O
2007	O
included	O
an	O
iTunes	O
Store	O
app	O
that	O
was	O
the	O
first	O
new	O
app	O
to	O
be	O
added	O
to	O
the	O
system	O
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
2	I-Operating_System
was	O
released	O
on	O
July	O
11	O
,	O
2008	O
,	O
at	O
the	O
same	O
time	O
as	O
the	O
release	O
of	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
,	O
and	O
introduced	O
Apple	B-Application
's	I-Application
App	I-Application
Store	I-Application
supporting	O
native	O
third-party	B-Operating_System
applications	I-Operating_System
,	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
support	O
,	O
push	B-General_Concept
e-mail	I-General_Concept
,	O
and	O
other	O
enhancements	O
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
3	I-Operating_System
was	O
released	O
on	O
June	O
17	O
,	O
2009	O
,	O
alongside	O
the	O
iPhone	B-Operating_System
3GS	I-Operating_System
,	O
and	O
introduced	O
copy	B-General_Concept
and	I-General_Concept
paste	I-General_Concept
functionality	O
,	O
Spotlight	B-Application
search	I-Application
for	O
the	O
home	B-Operating_System
screen	I-Operating_System
,	O
and	O
new	O
features	O
for	O
the	O
YouTube	B-General_Concept
app	I-General_Concept
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
3	I-Operating_System
was	O
available	O
for	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
as	O
well	O
as	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
and	O
3GS	B-Architecture
.	O
</s>
<s>
However	O
,	O
not	O
all	O
features	O
of	O
iPhone	B-Operating_System
OS	I-Operating_System
3	I-Operating_System
(	O
like	O
MMS	O
in	O
the	O
Messages	B-Protocol
app	O
)	O
were	O
supported	O
on	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
3.1.3	I-Operating_System
was	O
the	O
last	O
version	O
of	O
iPhone	B-Operating_System
OS	O
(	O
now	O
iOS	B-Application
)	O
to	O
be	O
released	O
for	O
this	O
phone	O
in	O
February	O
2010	O
,	O
which	O
never	O
got	O
the	O
full	O
iPhone	B-Operating_System
OS	I-Operating_System
3	I-Operating_System
feature	O
set	O
because	O
iPhone	B-Operating_System
OS	O
3.2	O
was	O
intended	O
for	O
the	B-Operating_System
iPad	I-Operating_System
.	O
</s>
<s>
Almost	O
all	O
apps	B-Application
released	O
after	O
the	O
release	O
of	O
iOS	B-Application
6	O
in	O
late	O
September	O
2012	O
do	O
not	O
run	O
on	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
,	O
as	O
the	O
software	O
development	O
kit	O
(	O
SDK	B-Operating_System
)	O
was	O
changed	O
to	O
no	O
longer	O
allow	O
the	O
"	O
targeting	O
"	O
(	O
minimum	O
)	O
of	O
iOS	B-Application
versions	O
older	O
than	O
4.3	O
(	O
including	O
3.x	O
)	O
,	O
or	O
ARMv6	O
devices	O
(	O
first	O
two	O
generations	O
)	O
.	O
</s>
<s>
The	O
original	B-Operating_System
iPhone	I-Operating_System
received	O
largely	O
positive	O
reviews	O
.	O
</s>
<s>
Only	O
four	O
writers	O
were	O
given	O
review	O
models	O
of	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
:	O
David	O
Pogue	O
of	O
The	O
New	O
York	O
Times	O
,	O
Walt	O
Mossberg	O
of	O
The	O
Wall	O
Street	O
Journal	O
,	O
Steven	O
Levy	O
of	O
Newsweek	O
,	O
and	O
Ed	O
Baig	O
of	O
USA	O
Today	O
.	O
</s>
<s>
The	O
New	O
York	O
Times	O
and	O
The	O
Wall	O
Street	O
Journal	O
published	O
positive	O
,	O
but	O
cautious	O
,	O
reviews	O
of	O
the	O
iPhone	B-Operating_System
,	O
their	O
primary	O
criticisms	O
being	O
the	O
relatively	O
slow	O
speed	O
of	O
the	O
T	O
's	O
2.5G	O
EDGE	O
network	O
and	O
the	O
phone	O
's	O
inability	O
to	O
connect	O
using	O
3G	B-Architecture
services	O
.	O
</s>
<s>
The	O
Wall	O
Street	O
Journals	O
technology	O
columnist	O
,	O
Walt	O
Mossberg	O
,	O
concluded	O
that	O
"	O
despite	O
some	O
flaws	O
and	O
feature	O
omissions	O
,	O
the	O
iPhone	B-Operating_System
is	O
,	O
on	O
balance	O
,	O
a	O
beautiful	O
and	O
breakthrough	O
handheld	O
computer.	O
"	O
</s>
