<s>
The	O
Sony	B-Application
Xperia	I-Application
U	I-Application
ST25i	O
(	O
ST25a	O
in	O
the	O
United	O
States	O
)	O
,	O
codenamed	O
Kumquat	O
during	O
its	O
development	O
,	O
is	O
an	O
Android	B-Application
smartphone	B-Application
from	O
Sony	O
.	O
</s>
<s>
It	O
was	O
launched	O
at	O
the	O
2012	O
Mobile	O
World	O
Congress	O
held	O
in	O
Barcelona	O
,	O
and	O
is	O
the	O
second	O
Sony-only	O
branded	O
smartphone	B-Application
after	O
Sony	O
acquired	O
Ericsson	O
's	O
stake	O
in	O
Sony	O
Ericsson	O
in	O
January	O
2012	O
.	O
</s>
<s>
The	O
Xperia	B-Application
U	I-Application
has	O
a	O
3.5-inch	O
(	O
88.9mm	O
)	O
touch-screen	B-Device
with	O
the	O
mobile	O
BRAVIA	O
engine	O
which	O
optimises	O
the	O
picture	O
,	O
a	O
1GHz	O
dual	O
core	O
processor	O
,	O
a	O
5	O
mega-pixel	O
rear	O
camera	O
,	O
0.3	O
mega-pixel	O
front	O
camera	O
,	O
512	O
MB	O
of	O
RAM	O
,	O
and	O
8	O
GB	O
of	O
internal	O
storage	O
.	O
</s>
<s>
On	O
23	O
January	O
,	O
its	O
name	O
was	O
revealed	O
as	O
Sony	B-Application
Xperia	I-Application
U	I-Application
.	O
</s>
<s>
The	O
capacitive	O
touchscreen	B-Device
display	O
measures	O
3.5inches	O
with	O
a	O
resolution	O
of	O
854	O
x	O
480	O
and	O
a	O
pixel	O
density	O
of	O
280	O
pixels	O
per	O
inch	O
.	O
</s>
<s>
It	O
supports	O
multi-touch	O
:	O
up	O
to	O
4	O
fingers	O
,	O
features	O
High	O
Definition	O
Reality	O
Display	O
with	O
mobile	O
BRAVIA	O
engine	O
from	O
Sony	O
,	O
and	O
is	O
capable	O
of	O
displaying	O
16,777,216	O
colours	O
.	O
</s>
<s>
The	O
device	O
features	O
a	O
STE	O
Nova	O
Thor	O
U8500	O
1GHz	O
dual	O
core	O
processor	O
,	O
512	O
MB	O
RAM(split into 392MB system memory and 120MB for the GPU )	O
,	O
Mali-400	O
GPU	O
,	O
8	O
GB	O
of	O
internal	O
storage	O
(	O
4	O
GB	O
of	O
which	O
is	O
available	O
to	O
the	O
user	O
)	O
and	O
a	O
micro-USB	O
connector	O
with	O
USB-OTG	O
support	O
.	O
</s>
<s>
The	O
Xperia	B-Application
U	I-Application
was	O
originally	O
released	O
with	O
Android	B-Application
2.3.7	I-Application
Gingerbread	B-Application
,	O
but	O
,	O
on	O
28	O
September	O
2012	O
,	O
Sony	O
released	O
an	O
update	O
to	O
Android	B-Application
4.0.4	O
Ice	O
Cream	O
Sandwich	O
.	O
</s>
<s>
Users	O
can	O
choose	O
to	O
keep	O
the	O
Gingerbread	B-Application
operating	O
system	O
,	O
or	O
,	O
using	O
Sony	O
PC	O
Companion	O
or	O
Bridge	O
for	O
Mac	O
,	O
they	O
could	O
upgrade	O
to	O
Ice	O
Cream	O
Sandwich	O
;	O
however	O
,	O
downgrading	O
to	O
Gingerbread	B-Application
is	O
not	O
officially	O
supported	O
.	O
</s>
<s>
The	O
Xperia	B-Application
U	I-Application
is	O
fully	O
Facebook	O
integrated	O
and	O
features	O
Sony	O
's	O
Timescape	O
UI	O
.	O
</s>
<s>
The	O
Sony	B-Application
Xperia	I-Application
U	I-Application
is	O
also	O
DLNA	O
certified	O
.	O
</s>
<s>
On	O
17	O
December	O
2012	O
,	O
Sony	O
confirmed	O
that	O
the	O
Xperia	B-Application
U	I-Application
will	O
not	O
be	O
updated	O
to	O
Android	B-Application
Jelly	O
Bean	O
4.1	O
due	O
to	O
hardware	O
incompatibility	O
.	O
</s>
<s>
Sony	O
later	O
reported	O
that	O
the	O
Xperia	B-Application
U	I-Application
was	O
not	O
updated	O
due	O
to	O
the	O
lack	O
of	O
RAM	O
.	O
</s>
<s>
Various	O
unofficial	O
updates	O
are	O
available	O
on	O
XDA-Developers	B-Application
Forums	O
.	O
</s>
<s>
This	O
way	O
the	O
phone	O
can	O
be	O
made	O
to	O
run	O
Android	B-Application
4.4	O
or	O
even	O
5.1.1	O
.	O
</s>
<s>
Installation	O
of	O
most	O
updates	O
requires	O
an	O
unlocked	O
boot	O
loader	O
and	O
a	O
rooted	B-Application
phone	O
.	O
</s>
<s>
Over	O
95%	O
of	O
the	O
Xperia	B-Application
U	I-Application
front	O
is	O
composed	O
of	O
the	O
display	O
portion	O
,	O
and	O
the	O
back	O
is	O
curved	O
slightly	O
for	O
comfort	O
like	O
on	O
the	O
Xperia	B-Application
S	I-Application
and	O
the	O
Xperia	B-Application
P	I-Application
.	O
It	O
has	O
transparent	O
strip	O
with	O
an	O
illuminated	O
light	O
bar	O
at	O
the	O
bottom	O
,	O
which	O
illuminates	O
when	O
the	O
user	O
taps	O
a	O
button	O
,	O
or	O
when	O
viewing	O
pictures	O
or	O
music	O
by	O
picking	O
up	O
the	O
dominant	O
colour	O
in	O
the	O
picture	O
.	O
</s>
<s>
The	O
illuminated	O
strip	O
is	O
used	O
on	O
custom	O
ROMs	O
to	O
show	O
notifications	O
since	O
the	O
notification	B-Application
LED	I-Application
of	O
the	O
phone	O
is	O
too	O
dim	O
to	O
be	O
really	O
noticeable	O
.	O
</s>
<s>
Xperia	B-Application
U	I-Application
generally	O
received	O
a	O
positive	O
response	O
from	O
critics	O
with	O
some	O
calling	O
it	O
as	O
a	O
budget	O
version	O
of	O
Xperia	B-Application
P	I-Application
and	O
Xperia	B-Application
S	I-Application
.	O
Critics	O
praised	O
the	O
Xperia	B-Application
U	I-Application
for	O
several	O
features	O
,	O
such	O
as	O
its	O
dual	O
core	O
processor	O
,	O
high	O
quality	O
display	O
,	O
and	O
5-megapixel	O
camera	O
,	O
but	O
criticized	O
it	O
for	O
the	O
lack	O
of	O
external	O
storage	O
and	O
not	O
having	O
Android	B-Application
Ice	O
Cream	O
Sandwich	O
pre-installed	O
.	O
</s>
<s>
Natasha	O
Lomas	O
of	O
CNET	O
gave	O
the	O
phone	O
4	O
out	O
of	O
5	O
,	O
saying	O
that	O
"	O
for	O
Android	B-Application
lovers	O
looking	O
for	O
a	O
budget	O
smartphone	B-Application
for	O
dainty	O
snacking	O
on	O
apps	O
and	O
mobile	O
websites	O
,	O
the	O
Xperia	B-Application
U	I-Application
is	O
a	O
worthy	O
contender	O
.	O
</s>
<s>
The	O
Sony	B-Application
Xperia	I-Application
U	I-Application
has	O
8	O
gigabytes	O
of	O
internal	O
storage	O
.	O
</s>
<s>
2	O
GB	O
are	O
reserved	O
for	O
the	O
Android	B-Application
OS	I-Application
,	O
and	O
the	O
remaining	O
2	O
GB	O
are	O
used	O
for	O
downloaded	O
apps	O
.	O
</s>
<s>
The	O
phone	O
supports	O
MTP	B-Protocol
,	O
but	O
this	O
can	O
unofficially	O
be	O
changed	O
on	O
rooted	B-Application
phones	O
so	O
that	O
the	O
4GB	O
are	O
accessible	O
from	O
the	O
computer	O
like	O
an	O
SD	O
card	O
.	O
</s>
