<s>
The	O
Nokia	B-Language
E52	I-Language
and	O
Nokia	B-Language
E55	I-Language
are	O
smartphones	B-Application
from	O
Nokia	O
's	O
business-oriented	O
Eseries	B-Language
range	O
.	O
</s>
<s>
They	O
run	O
Symbian	B-Operating_System
OS	I-Operating_System
v9.3	O
(	O
S60	B-Language
3rd	O
Edition	O
FP1	O
)	O
.	O
</s>
<s>
They	O
are	O
both	O
physically	O
and	O
functionally	O
identical	O
,	O
except	O
that	O
the	O
E55	O
has	O
a	O
'	O
half-QWERTY	O
'	O
keyboard	O
,	O
similar	O
to	O
the	O
SureType	B-Application
keyboard	O
on	O
BlackBerry	B-Operating_System
Pearl	I-Operating_System
,	O
whereas	O
the	O
E52	O
revision	O
has	O
a	O
traditional	O
T9	B-General_Concept
keypad	I-General_Concept
.	O
</s>
<s>
Nokia	O
called	O
the	O
E55	O
the	O
world	O
's	O
thinnest	O
smartphone	B-Application
(	O
it	O
was	O
just	O
0.1mm	O
thinner	O
than	O
Nokia	B-Language
E71	I-Language
)	O
.	O
</s>
<s>
If	O
WiFi	O
,	O
Bluetooth	B-Protocol
are	O
used	O
and	O
built-in	O
VOIP	O
client	O
is	O
active	O
,	O
the	O
battery	O
will	O
last	O
about	O
24	O
hours	O
.	O
</s>
