<s>
The	O
Nokia	B-Device
Lumia	I-Device
520	I-Device
is	O
an	O
entry-level	O
Windows	B-Application
Phone	O
8	O
smartphone	B-Application
announced	O
by	O
Nokia	O
at	O
the	O
2013	O
Mobile	O
World	O
Congress	O
.	O
</s>
<s>
In	O
September	O
2013	O
,	O
the	O
Lumia	B-Device
520	I-Device
became	O
the	O
best-selling	O
Windows	B-Application
device	O
in	O
the	O
world	O
,	O
selling	O
more	O
units	O
than	O
any	O
other	O
model	O
of	O
Windows	B-Application
phone	O
,	O
PC	O
or	O
tablet	O
.	O
</s>
<s>
By	O
July	O
2014	O
,	O
the	O
Lumia	B-Device
520	I-Device
has	O
had	O
12	O
million	O
activations	O
,	O
and	O
has	O
played	O
a	O
key	O
part	O
for	O
Nokia	O
and	O
Microsoft	O
.	O
</s>
<s>
A	O
minor	O
successor	O
,	O
the	O
Nokia	B-Device
Lumia	I-Device
525	I-Device
,	O
was	O
later	O
released	O
.	O
</s>
<s>
The	O
Lumia	B-Device
520	I-Device
comes	O
in	O
a	O
slate	O
shape	O
with	O
4-inch	O
SuperSensitive	O
touchscreen	B-Device
.	O
</s>
<s>
The	O
viewing	O
angles	O
are	O
slightly	O
reduced	O
compared	O
to	O
other	O
phones	O
in	O
the	O
Lumia	B-Device
line	O
.	O
</s>
<s>
The	O
Lumia	B-Device
520	I-Device
shares	O
the	O
same	O
screen	O
resolution	O
of	O
800x480	O
as	O
the	O
more	O
expensive	O
Lumia	B-Application
620	I-Application
,	O
720	O
and	O
820	O
,	O
and	O
actually	O
has	O
a	O
higher	O
pixel	O
density	O
than	O
the	O
720	O
.	O
</s>
<s>
The	O
touchscreen	B-Device
is	O
designed	O
to	O
be	O
sensitive	O
enough	O
that	O
one	O
can	O
use	O
it	O
while	O
wearing	O
gloves	O
or	O
with	O
fingernails	O
.	O
</s>
<s>
Aside	O
from	O
the	O
screen	O
,	O
the	O
front	O
of	O
the	O
phone	O
contains	O
the	O
Windows	B-Application
Phone	O
8	O
standard	O
Back	O
,	O
Start	O
and	O
Search	O
buttons	O
,	O
along	O
with	O
a	O
speaker	O
.	O
</s>
<s>
The	O
sides	O
of	O
the	O
phone	O
also	O
have	O
standard	O
Windows	B-Application
Phone	O
features	O
,	O
as	O
required	O
by	O
Microsoft	O
–	O
volume	O
keys	O
,	O
camera	O
key	O
,	O
power/lock	O
key	O
,	O
3.5mm	O
headphone	O
jack	O
and	O
micro-USB	B-Protocol
connector	O
,	O
which	O
is	O
also	O
used	O
for	O
charging	O
purposes	O
.	O
</s>
<s>
The	O
Lumia	B-Device
520	I-Device
ships	O
with	O
8GB	O
(	O
8	O
×	O
230	O
bytes	O
)	O
of	O
internal	O
storage	O
with	O
about	O
3GB	O
of	O
the	O
storage	O
taken	O
up	O
by	O
the	O
operating	O
system	O
.	O
</s>
<s>
The	O
Lumia	B-Device
520	I-Device
has	O
a	O
1430mAh	O
battery	O
,	O
which	O
is	O
larger	O
than	O
the	O
1300mAh	O
battery	O
in	O
the	O
Lumia	B-Application
620	I-Application
.	O
</s>
<s>
The	O
Nokia	B-Device
Lumia	I-Device
525	I-Device
launched	O
as	O
the	O
successor	O
to	O
the	O
Nokia	B-Device
Lumia	I-Device
520	I-Device
with	O
nearly	O
the	O
same	O
specifications	O
and	O
appearance	O
.	O
</s>
<s>
The	O
Lumia	B-Device
525	I-Device
doubles	O
the	O
RAM	B-Architecture
from	O
512	O
MB	O
to	O
1	O
GB	O
,	O
therefore	O
making	O
it	O
compatible	O
with	O
more	O
demanding	O
games	O
and	O
apps	O
.	O
</s>
<s>
The	O
Lumia	B-Device
520	I-Device
ships	O
with	O
Microsoft	B-Application
Windows	I-Application
Phone	O
8	O
,	O
as	O
well	O
as	O
exclusive	O
software	O
like	O
Nokia	O
Mix	O
Radio	O
and	O
HERE	B-Application
Maps	I-Application
(	O
featuring	O
turn-by-turn	O
directions	O
,	O
offline	O
maps	O
and	O
navigation	O
,	O
and	O
transit	O
info	O
)	O
.	O
</s>
<s>
The	O
phone	O
received	O
the	O
Lumia	B-Device
Amber	O
software	O
update	O
in	O
mid-2013	O
,	O
which	O
brought	O
numerous	O
bug	O
fixes	O
and	O
improvements	O
,	O
including	O
the	O
ability	O
to	O
capture	O
steadier	O
images	O
,	O
and	O
the	O
Lumia	B-Device
Black	O
update	O
in	O
late	O
2013	O
.	O
</s>
<s>
The	O
Lumia	B-Device
520	I-Device
can	O
be	O
upgraded	O
to	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
as	O
part	O
of	O
the	O
Lumia	B-Device
Cyan	O
update	O
.	O
</s>
<s>
Although	O
a	O
port	O
was	O
initially	O
released	O
as	O
an	O
insider	O
preview	O
,	O
the	O
phone	O
will	O
not	O
receive	O
the	O
upgrade	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
,	O
which	O
has	O
been	O
attributed	O
to	O
being	O
due	O
to	O
having	O
only	O
512MB	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
An	O
Android	B-Application
Marshmallow	I-Application
6.0.1	O
port	O
to	O
the	O
phone	O
is	O
underway	O
at	O
XDA	B-Application
Developers	I-Application
,	O
after	O
developers	O
became	O
able	O
to	O
replace	O
the	O
UEFI	B-Architecture
bootloader	B-Application
used	O
for	O
Windows	B-Application
with	O
the	O
Qualcomm	O
Little	O
Kernel	O
bootloader	B-Application
used	O
to	O
boot	O
Android	O
and	O
other	O
Linux-based	O
operating	O
systems	O
.	O
</s>
<s>
CNET	O
called	O
the	O
Lumia	B-Device
520	I-Device
"	O
tremendous	O
value	O
on	O
an	O
easy-to-use	O
device	O
"	O
;	O
and	O
said	O
of	O
its	O
variant	O
,	O
the	O
Lumia	B-Device
521	I-Device
,	O
"	O
Though	O
it	O
lacks	O
4G	O
LTE	O
support	O
,	O
the	O
$150	O
Nokia	B-Device
Lumia	I-Device
521	I-Device
still	O
gives	O
you	O
quite	O
a	O
bit	O
for	O
your	O
money	O
.	O
</s>
<s>
The	O
price	O
of	O
the	O
Lumia	B-Device
520	I-Device
was	O
halved	O
to	O
$50	O
in	O
the	O
United	O
States	O
and	O
£70	O
in	O
the	O
UK	O
for	O
Christmas	O
2013	O
season	O
.	O
</s>
<s>
Similar	O
to	O
other	O
budget	O
phones	O
like	O
the	O
Lumia	B-Application
620	I-Application
and	O
Lumia	B-Application
720	I-Application
,	O
it	O
only	O
has	O
512MB	O
of	O
RAM	B-Architecture
,	O
half	O
the	O
RAM	B-Architecture
of	O
the	O
first	O
Windows	B-Application
Phone	O
8	O
devices	O
,	O
causing	O
certain	O
applications	O
and	O
features	O
to	O
not	O
run	O
.	O
</s>
<s>
On	O
27	O
November	O
2013	O
,	O
the	O
Nokia	B-Device
Lumia	I-Device
525	I-Device
was	O
announced	O
in	O
Singapore	O
.	O
</s>
<s>
It	O
increases	O
the	O
RAM	B-Architecture
to	O
1GB	O
to	O
allow	O
all	O
Windows	B-Application
Phone	O
features	O
and	O
applications	O
to	O
run	O
.	O
</s>
<s>
A	O
special	O
variant	O
,	O
the	O
Nokia	B-Device
Lumia	I-Device
521	O
,	O
was	O
created	O
for	O
T-Mobile	O
US	O
.	O
</s>
<s>
The	O
Nokia	B-Device
Lumia	I-Device
521	O
's	O
first	O
retail	O
release	O
was	O
on	O
27	O
April	O
2013	O
.	O
</s>
