<s>
iOS	B-Operating_System
5	I-Operating_System
is	O
the	O
fifth	B-Operating_System
major	I-Operating_System
release	I-Operating_System
of	O
the	O
iOS	B-Application
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
developed	O
by	O
Apple	O
Inc.	O
,	O
being	O
the	O
successor	O
to	O
iOS	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
It	O
was	O
succeeded	O
by	O
iOS	B-Operating_System
6	I-Operating_System
on	O
September	O
19	O
,	O
2012	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
revamped	O
notifications	O
,	O
adding	O
temporary	O
banners	O
that	O
appear	O
at	O
the	O
top	O
of	O
screen	O
and	O
introducing	O
the	O
Notification	B-Operating_System
Center	I-Operating_System
,	O
a	O
central	O
location	O
for	O
all	O
recent	O
notifications	O
.	O
</s>
<s>
The	O
operating	O
system	O
also	O
added	O
iCloud	B-Application
,	O
Apple	O
's	O
cloud	B-Application
storage	I-Application
service	I-Application
for	O
synchronization	O
of	O
content	O
and	O
data	O
across	O
iCloud-enabled	O
devices	O
,	O
and	O
iMessage	O
,	O
Apple	O
's	O
instant	B-Application
messaging	I-Application
service	O
.	O
</s>
<s>
For	O
the	O
first	O
time	O
,	O
system	O
software	O
updates	O
could	O
be	O
installed	O
wirelessly	O
,	O
without	O
requiring	O
a	O
computer	O
and	O
iTunes	B-Operating_System
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
also	O
featured	O
deep	O
integration	O
with	O
Twitter	B-Application
,	O
introduced	O
multitasking	O
gestures	O
on	O
iPads	B-Operating_System
,	O
and	O
added	O
an	O
easily	O
accessible	O
camera	O
shortcut	O
from	O
the	O
lock	O
screen	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
was	O
the	O
subject	O
of	O
criticism	O
for	O
iPhone	B-Operating_System
4S	I-Operating_System
users	O
,	O
as	O
the	O
initial	O
release	O
had	O
poor	O
battery	O
life	O
,	O
failures	O
of	O
SIM	O
cards	O
,	O
and	O
echoes	O
during	O
phone	O
calls	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
was	O
introduced	O
at	O
the	O
Apple	O
Worldwide	O
Developers	O
Conference	O
on	O
June	O
6	O
,	O
2011	O
,	O
with	O
a	O
beta	O
version	O
available	O
for	O
developers	O
later	O
that	O
day	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
was	O
officially	O
released	O
on	O
October	O
12	O
,	O
2011	O
.	O
</s>
<s>
In	O
previous	O
iOS	B-Application
versions	O
,	O
notifications	O
popped	O
up	O
on	O
the	O
screen	O
as	O
dialog	O
boxes	O
,	O
interrupting	O
the	O
current	O
activity	O
.	O
</s>
<s>
In	O
iOS	B-Operating_System
5	I-Operating_System
,	O
notifications	O
are	O
revamped	O
,	O
and	O
show	O
up	O
as	O
a	O
temporary	O
banner	O
at	O
the	O
top	O
of	O
the	O
screen	O
.	O
</s>
<s>
Recent	O
notifications	O
can	O
also	O
be	O
accessed	O
by	O
pulling	O
a	O
"	O
Notification	B-Operating_System
Center	I-Operating_System
"	O
down	O
from	O
the	O
top	O
of	O
the	O
screen	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
introduces	O
iCloud	B-Application
,	O
Apple	O
's	O
cloud	B-Application
storage	I-Application
service	I-Application
.	O
</s>
<s>
The	O
new	O
service	O
allows	O
users	O
to	O
synchronize	O
their	O
music	O
,	O
pictures	O
,	O
videos	O
,	O
and	O
application	O
data	O
across	O
all	O
of	O
their	O
iCloud-enabled	O
devices	O
for	O
free	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
enables	O
wireless	O
system	O
updates	O
on	O
supported	O
devices	O
,	O
meaning	O
a	O
computer	O
and	O
iTunes	B-Operating_System
are	O
n't	O
necessary	O
to	O
update	O
devices	O
.	O
</s>
<s>
iOS	B-Operating_System
5	I-Operating_System
features	O
deep	O
Twitter	B-Application
integration	O
.	O
</s>
<s>
Users	O
are	O
able	O
to	O
sign	O
in	O
to	O
Twitter	B-Application
directly	O
from	O
the	O
Settings	O
menu	O
.	O
</s>
<s>
Photos	O
can	O
be	O
"	O
tweeted	O
"	O
directly	O
from	O
the	O
Photos	O
or	O
Camera	O
apps	O
,	O
and	O
users	O
are	O
also	O
able	O
to	O
tweet	O
from	O
the	O
Safari	B-Application
,	O
YouTube	B-General_Concept
,	O
and	O
Google	O
Maps	O
apps	O
.	O
</s>
<s>
Multitasking	O
gestures	O
debut	O
on	O
iPad	B-Operating_System
with	O
the	O
release	O
of	O
iOS	B-Operating_System
5	I-Operating_System
.	O
</s>
<s>
Multitasking	O
gestures	O
were	O
only	O
available	O
on	O
the	O
iPad	B-Operating_System
2	I-Operating_System
.	O
</s>
<s>
The	O
iPad	B-Operating_System
keyboard	O
could	O
be	O
undocked	O
from	O
the	O
bottom	O
of	O
the	O
screen	O
,	O
and	O
could	O
be	O
split	O
into	O
two	O
half-keyboards	O
.	O
</s>
<s>
Siri	B-Application
,	O
Apple	O
's	O
voice	O
assistant	O
,	O
is	O
supported	O
on	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
only	O
.	O
</s>
<s>
It	O
was	O
later	O
extended	O
to	O
other	O
devices	O
in	O
iOS	B-Operating_System
6	I-Operating_System
.	O
</s>
<s>
The	O
first	O
iOS	B-Operating_System
5	I-Operating_System
release	O
allowed	O
the	O
Camera	O
app	O
to	O
be	O
easily	O
accessed	O
from	O
the	O
lock	O
screen	O
for	O
the	O
first	O
time	O
.	O
</s>
<s>
iMessage	O
,	O
a	O
new	O
instant	B-Application
messaging	I-Application
service	O
built	O
into	O
the	O
Messages	B-Protocol
app	O
,	O
allowed	O
anyone	O
with	O
an	O
iOS	B-Operating_System
5	I-Operating_System
device	O
to	O
send	O
both	O
basic	O
and	O
multimedia	O
messages	B-Protocol
to	O
anyone	O
else	O
with	O
a	O
compatible	O
iOS	B-Operating_System
5	I-Operating_System
device	O
.	O
</s>
<s>
In	O
contrast	O
to	O
SMS	B-Device
,	O
messages	B-Protocol
sent	O
through	O
iMessage	O
use	O
the	O
Internet	O
rather	O
than	O
regular	O
cellular	O
texting	O
,	O
but	O
also	O
in	O
contrast	O
to	O
regular	O
SMS	B-Device
,	O
Android	B-Application
and	O
BlackBerry	B-Application
devices	O
are	O
not	O
compatible	O
with	O
the	O
service	O
.	O
</s>
<s>
iMessages	O
are	O
synchronized	O
across	O
the	O
user	O
's	O
devices	O
,	O
and	O
are	O
color-coded	O
blue	O
,	O
with	O
regular	O
SMS	B-Device
in	O
green	O
.	O
</s>
<s>
The	O
iOS	B-Application
Mail	B-Operating_System
app	O
included	O
rich	O
text	O
formatting	O
,	O
better	O
indent	O
control	O
,	O
flagging	O
of	O
messages	B-Protocol
,	O
and	O
the	O
ability	O
to	O
drag	O
addresses	O
between	O
To	O
,	O
CC	O
,	O
and	O
BCC	O
lines	O
.	O
</s>
<s>
Reminders	B-Application
allows	O
users	O
to	O
create	O
lists	O
of	O
tasks	O
with	O
alerts	O
that	O
can	O
either	O
be	O
date-based	O
or	O
location-based	O
.	O
</s>
<s>
The	O
initial	O
October	O
2011	O
release	O
of	O
iOS	B-Operating_System
5	I-Operating_System
saw	O
significant	O
upgrade	O
issues	O
,	O
with	O
errors	O
during	O
installation	O
and	O
Apple	O
server	O
overload	O
.	O
</s>
<s>
Following	O
user	O
complaints	O
,	O
Apple	O
officially	O
confirmed	O
that	O
iOS	B-Operating_System
5	I-Operating_System
had	O
poor	O
battery	O
life	O
for	O
some	O
iPhone	B-Operating_System
4S	I-Operating_System
users	O
,	O
and	O
stated	O
that	O
an	O
upcoming	O
software	O
update	O
would	O
fix	O
the	O
issues	O
.	O
</s>
<s>
In	O
November	O
2011	O
,	O
Engadget	B-Application
reported	O
that	O
the	O
iOS	B-Operating_System
5	I-Operating_System
update	O
caused	O
Wi-Fi	O
connection	O
drops	O
for	O
some	O
users	O
.	O
</s>
<s>
Some	O
iPhone	B-Operating_System
4S	I-Operating_System
users	O
reported	O
issues	O
with	O
the	O
SIM	O
card	O
in	O
iOS	B-Operating_System
5	I-Operating_System
,	O
being	O
given	O
error	O
messages	B-Protocol
about	O
"	O
Invalid	O
SIM	O
"	O
and	O
"	O
SIM	O
Failure	O
"	O
.	O
</s>
<s>
Some	O
iPhone	B-Operating_System
4S	I-Operating_System
users	O
reported	O
the	O
random	O
appearance	O
of	O
echoes	O
during	O
phone	O
calls	O
made	O
with	O
earphones	O
in	O
the	O
initial	O
release	O
of	O
iOS	B-Operating_System
5	I-Operating_System
.	O
</s>
<s>
Many	O
aspects	O
of	O
iOS	B-Operating_System
5	I-Operating_System
received	O
positive	O
reviews	O
,	O
including	O
the	O
new	O
notification	B-Operating_System
center	I-Operating_System
,	O
the	O
ability	O
to	O
sync	O
and	O
update	O
wirelessly	O
,	O
iMessage	O
,	O
and	O
more	O
.	O
</s>
<s>
Richmond	O
Shane	O
of	O
Telegraph	O
said	O
"	O
iOS	B-Operating_System
5	I-Operating_System
is	O
a	O
brilliant	O
upgrade	O
to	O
an	O
already	O
brilliant	O
operating	O
system	O
.	O
</s>
<s>
Different	O
people	O
look	O
for	O
different	O
things	O
in	O
a	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
.	O
</s>
<s>
That	O
's	O
why	O
some	O
people	O
prefer	O
BlackBerry	B-Application
,	O
Android	B-Application
or	O
Windows	O
Mobile	O
.	O
</s>
<s>
With	O
iOS	B-Operating_System
5	I-Operating_System
,	O
Apple	O
continues	O
to	O
deliver	O
the	O
best	O
user	O
experience	O
available.	O
"	O
</s>
<s>
Richard	O
Goodwin	O
of	O
Know	O
Your	O
Mobile	O
said	O
"	O
All	O
in	O
all	O
,	O
we	O
reckon	O
iOS	B-Operating_System
5	I-Operating_System
is	O
everything	O
it	O
needs	O
to	O
be	O
a	O
more	O
.	O
</s>
<s>
With	O
this	O
release	O
,	O
Apple	O
dropped	O
support	O
for	O
older	O
devices	O
,	O
specifically	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
and	O
the	O
second-generation	B-Device
iPod	I-Device
Touch	I-Device
.	O
</s>
