<s>
The	O
LG	B-Application
Optimus	I-Application
series	I-Application
is	O
a	O
series	O
of	O
smartphones	B-Application
and	O
tablet	B-Device
computers	I-Device
manufactured	O
by	O
LG	O
Electronics	O
.	O
</s>
<s>
Optimus-branded	O
devices	O
have	O
been	O
produced	O
running	O
both	O
the	O
Android	B-Application
and	O
Windows	O
Phone	O
7	O
operating	O
systems	O
.	O
</s>
<s>
LG	B-Application
Optimus	I-Application
Slider	O
,	O
released	O
by	O
Virgin	O
Mobile	O
USA	O
on	O
October	O
17	O
,	O
2011	O
.	O
</s>
<s>
The	O
LG	B-Application
Optimus	I-Application
One	I-Application
,	O
released	O
in	O
October	O
2010	O
,	O
is	O
LG	O
's	O
second	O
phone	O
in	O
the	O
Optimus	O
series	O
.	O
</s>
<s>
Due	O
to	O
network	O
differences	O
between	O
carriers	O
,	O
LG	O
created	O
a	O
sub-series	O
with	O
carrier-specific	O
variants	O
based	O
on	O
the	O
Optimus	B-Application
One	I-Application
.	O
</s>
<s>
Over	O
two	O
million	O
of	O
the	O
Optimus	B-Application
One	I-Application
and	O
its	O
carrier	O
variants	O
combined	O
have	O
been	O
sold	O
.	O
</s>
<s>
LG	B-Application
Optimus	I-Application
L	O
is	O
an	O
Android	B-Application
sub-series	O
launched	O
in	O
2012	O
.	O
</s>
<s>
LG	B-Application
Optimus	I-Application
F	O
is	O
an	O
Android	B-Application
sub-series	O
announced	O
on	O
February	O
21	O
,	O
2013	O
.	O
</s>
<s>
The	O
Optimus	B-Application
G	I-Application
sub-series	O
was	O
introduced	O
for	O
LG	O
's	O
high-end	O
devices	O
in	O
2012	O
.	O
</s>
<s>
In	O
2013	O
,	O
after	O
releasing	O
two	O
devices	O
carrying	O
the	O
Optimus	B-Application
G	I-Application
branding	O
,	O
future	O
products	O
(	O
such	O
as	O
the	O
LG	B-Application
G2	I-Application
)	O
dropped	O
the	O
Optimus	O
brand	O
entirely	O
as	O
part	O
of	O
a	O
new	O
separate	O
G	O
line	O
.	O
</s>
<s>
LG	O
only	O
released	O
two	O
LG	B-Application
Optimus	I-Application
phones	O
with	O
the	O
Windows	O
Phone	O
operating	O
system	O
,	O
compared	O
to	O
20	O
unique	O
Android	B-Application
smartphones	B-Application
.	O
</s>
<s>
The	O
first	O
of	O
these	O
was	O
the	O
LG	B-Application
Optimus	I-Application
7	I-Application
,	O
released	O
in	O
November	O
2010	O
.	O
</s>
<s>
It	O
was	O
followed	O
by	O
the	O
LG	B-Application
Quantum	I-Application
,	O
alternatively	O
Optimus	O
7Q	O
or	O
Optimus	O
Quantum	O
,	O
a	O
variant	O
with	O
a	O
physical	O
keyboard	O
.	O
</s>
