<s>
iPhone	B-Operating_System
OS	I-Operating_System
2	I-Operating_System
is	O
the	O
second	B-Operating_System
major	O
release	O
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
iPhone	B-Operating_System
OS	I-Operating_System
1	I-Operating_System
.	O
</s>
<s>
It	O
was	O
the	O
first	O
release	O
of	O
iOS	B-Application
to	O
support	O
third-party	O
applications	O
via	O
the	O
App	B-Application
Store	I-Application
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
2.2.1	I-Operating_System
was	O
the	O
final	O
version	O
of	O
iPhone	B-Operating_System
OS	I-Operating_System
2	I-Operating_System
.	O
</s>
<s>
It	O
was	O
succeeded	O
by	O
iPhone	B-Operating_System
OS	I-Operating_System
3	I-Operating_System
on	O
June	O
17	O
,	O
2009	O
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
2.0	I-Operating_System
became	O
available	O
on	O
July	O
11	O
,	O
2008	O
with	O
the	O
release	O
of	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
.	O
</s>
<s>
Devices	O
running	O
iPhone	B-Operating_System
OS	I-Operating_System
1	I-Operating_System
are	O
upgradable	O
to	O
this	O
version	O
.	O
</s>
<s>
This	O
version	O
of	O
iOS	B-Application
introduces	O
the	O
App	B-Application
Store	I-Application
,	O
making	O
third-party	O
applications	O
available	O
to	O
the	O
iPhone	B-Operating_System
and	O
iPod	B-Device
Touch	I-Device
.	O
</s>
<s>
Prior	O
to	O
the	O
public	O
release	O
of	O
iPhone	B-Operating_System
OS	I-Operating_System
2.0	I-Operating_System
,	O
Apple	O
held	O
a	O
keynote	O
event	O
to	O
announce	O
the	O
iPhone	B-Operating_System
OS	I-Operating_System
Software	I-Operating_System
Development	I-Operating_System
Kit	I-Operating_System
(	O
"	O
SDK	O
"	O
)	O
to	O
developers	O
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
2	I-Operating_System
was	O
introduced	O
at	O
the	O
Apple	O
Worldwide	O
Developers	O
Conference	O
keynote	O
address	O
on	O
June	O
9	O
,	O
2008	O
.	O
</s>
<s>
iPhone	B-Operating_System
OS	I-Operating_System
2.0	I-Operating_System
was	O
released	O
on	O
July	O
11	O
,	O
2008	O
.	O
</s>
<s>
It	O
was	O
released	O
along	O
with	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
,	O
and	O
ran	O
on	O
the	O
first-generation	B-Operating_System
iPhone	I-Operating_System
as	O
well	O
.	O
</s>
<s>
The	O
most	O
notable	O
feature	O
of	O
iPhone	B-Operating_System
OS	I-Operating_System
2	I-Operating_System
was	O
the	O
App	B-Application
Store	I-Application
.	O
</s>
<s>
Before	O
this	O
feature	O
was	O
introduced	O
,	O
the	O
only	O
way	O
to	O
install	O
custom	O
applications	O
on	O
the	O
device	O
was	O
via	O
jailbreaking	B-Application
,	O
which	O
is	O
strongly	O
discouraged	O
and	O
unsupported	O
by	O
Apple	O
.	O
</s>
<s>
There	O
were	O
500	O
applications	O
available	O
for	O
download	O
at	O
the	O
launch	O
of	O
the	O
App	B-Application
Store	I-Application
,	O
though	O
this	O
amount	O
has	O
grown	O
dramatically	O
since	O
then	O
.	O
</s>
<s>
Now	O
,	O
the	O
App	B-Application
Store	I-Application
has	O
more	O
than	O
4	O
million	O
apps	O
and	O
games	O
as	O
of	O
2021	O
.	O
</s>
<s>
The	O
Mail	B-Operating_System
app	O
had	O
a	O
makeover	O
,	O
having	O
push-emails	O
that	O
provide	O
an	O
always-on	O
capability	O
.	O
</s>
<s>
It	O
also	O
supports	O
Microsoft	B-Application
Office	I-Application
attachments	O
,	O
as	O
well	O
as	O
iWork	B-Application
attachments	O
.	O
</s>
<s>
The	O
Contacts	O
app	O
now	O
has	O
a	O
new	O
home	O
screen	O
icon	O
that	O
is	O
only	O
available	O
on	O
iPod	B-Device
Touch	I-Device
.	O
</s>
<s>
New	O
features	O
were	O
added	O
to	O
the	O
Maps	B-Application
app	O
in	O
the	O
iPhone	B-Operating_System
OS	I-Operating_System
2.2	I-Operating_System
software	O
update	O
.	O
</s>
<s>
Among	O
the	O
features	O
added	O
are	O
the	O
inclusion	O
of	O
Google	B-Application
Street	I-Application
View	I-Application
,	O
directions	O
to	O
public	O
transit	O
and	O
while	O
walking	O
,	O
and	O
the	O
ability	O
to	O
display	O
the	O
address	O
of	O
a	O
dropped	O
pin	O
.	O
</s>
<s>
When	O
the	O
device	O
is	O
in	O
landscape	O
mode	O
,	O
the	O
calculator	B-Operating_System
app	O
displays	O
a	O
scientific	O
calculator	B-Operating_System
.	O
</s>
<s>
Settings	B-General_Concept
now	O
has	O
an	O
ability	O
to	O
turn	O
Wi-Fi	O
back	O
on	O
while	O
in	O
Airplane	O
mode	O
,	O
as	O
well	O
as	O
the	O
ability	O
to	O
turn	O
on/off	O
Location	O
Services	O
.	O
</s>
<s>
Rene	O
Ritchie	O
at	O
iMore	O
said	O
,	O
"	O
Overall	O
,	O
iPhone	B-Operating_System
Firmware	O
2.0	O
is	O
a	O
stunning	O
achievement	O
that	O
really	O
puts	O
the	O
iPhone	B-Operating_System
on	O
par	O
with	O
the	O
Apple	O
II	O
and	O
Mac	O
as	O
one	O
of	O
the	O
great	O
revolutions	O
in	O
modern	O
technology	O
.	O
</s>
<s>
It	O
takes	O
it	O
beyond	O
simple	O
Phone	O
+	O
iPod	B-Operating_System
,	O
or	O
even	O
smartphone	O
,	O
and	O
makes	O
it	O
the	O
leading	O
contender	O
for	O
the	O
next	O
great	O
shift	O
in	O
computing.	O
"	O
</s>
<s>
Macworld	O
said	O
,	O
"	O
The	O
iPhone	B-Operating_System
2.0	I-Operating_System
software	O
is	O
full	O
of	O
the	O
kind	O
of	O
refinements	O
that	O
you	O
'd	O
expect	O
from	O
a	O
second-generation	O
Apple	O
product	O
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
OS	O
still	O
is	O
n't	O
perfect	O
,	O
and	O
we	O
wish	O
Apple	O
has	O
addressed	O
some	O
lingering	O
shortcomings	O
,	O
but	O
it	O
's	O
a	O
welcome	O
step-up	O
for	O
what	O
was	O
already	O
arguably	O
the	O
best	O
mobile	B-Operating_System
platform	I-Operating_System
on	O
the	O
market.	O
"	O
</s>
<s>
The	O
update	O
from	O
iPhone	B-Operating_System
OS	O
1.x	O
to	O
iPhone	B-Operating_System
OS	I-Operating_System
2.0	I-Operating_System
cost	O
$9.95	O
for	O
iPod	B-Device
touch	I-Device
users	O
;	O
it	O
was	O
free	O
for	O
iPhone	B-Operating_System
users	O
.	O
</s>
<s>
Upgrades	O
to	O
iPhone	B-Operating_System
OS	I-Operating_System
2.1	I-Operating_System
or	O
2.2	O
from	O
iPhone	B-Operating_System
OS	I-Operating_System
2.0	I-Operating_System
were	O
free	O
for	O
iPod	B-Device
touch	I-Device
users	O
.	O
</s>
