<s>
The	O
BlackBerry	B-Operating_System
Curve	I-Operating_System
8520	I-Operating_System
is	O
a	O
smartphone	B-Application
from	O
the	O
BlackBerry	B-Application
Curve	O
series	O
manufactured	O
in	O
Canada	O
.	O
</s>
<s>
It	O
is	O
also	O
known	O
as	O
the	O
BlackBerry	B-Application
Gemini	O
.	O
</s>
<s>
The	O
BlackBerry	B-Operating_System
Curve	I-Operating_System
8520	I-Operating_System
is	O
a	O
consumer	O
smartphone	B-Application
and	O
has	O
standard	O
features	O
including	O
mobile	O
email	O
,	O
calendar	O
and	O
instant	O
messaging	O
among	O
many	O
others	O
.	O
</s>
<s>
The	O
Curve	O
8520	O
has	O
a	O
new	O
touch-sensitive	O
optical	B-Device
trackpad	I-Device
as	O
opposed	O
to	O
the	O
trackball	O
used	O
on	O
many	O
other	O
BlackBerry	B-Application
devices	O
-	O
this	O
is	O
said	O
to	O
improve	O
the	O
ease	O
of	O
scrolling	O
through	O
menus	O
,	O
emails	O
,	O
Web	O
pages	O
and	O
images	O
.	O
</s>
<s>
The	O
Curve	O
8520	O
was	O
discontinued	O
in	O
April	O
2012	O
,	O
when	O
the	O
BlackBerry	B-Application
Curve	O
9220	O
was	O
introduced	O
as	O
its	O
successor	O
.	O
</s>
