<s>
Samsung	B-Application
Galaxy	I-Application
S	I-Application
Duos	I-Application
3	I-Application
is	O
a	O
dual	O
SIM	O
Android	B-Application
smartphone	B-Application
,	O
produced	O
and	O
marketed	O
by	O
Samsung	B-Application
Electronics	O
,	O
which	O
serves	O
as	O
an	O
immediate	O
successor	O
to	O
the	O
original	O
Galaxy	B-Application
S	I-Application
Duos	I-Application
2	I-Application
of	O
2013	O
.	O
</s>
<s>
In	O
contrast	O
with	O
other	O
dual	O
SIM	O
Samsung	B-Application
models	O
,	O
this	O
phone	O
is	O
a	O
part	O
of	O
the	O
high-end	O
"	O
S	O
"	O
series	O
,	O
this	O
is	O
why	O
it	O
is	O
marketed	O
as	O
a	O
part	O
of	O
the	O
"	O
Galaxy	B-Application
S	I-Application
"	O
family	O
.	O
</s>
<s>
Despite	O
being	O
called	O
as	O
a	O
direct	O
successor	O
to	O
the	O
original	O
S	O
Duos	O
2	O
phone	O
,	O
external	O
and	O
physical	O
design	O
of	O
the	O
model	O
is	O
identical	O
to	O
the	O
original	O
model	O
,	O
except	O
for	O
the	O
menu	O
button	O
which	O
is	O
now	O
replaced	O
by	O
the	O
recent	O
apps	O
button	O
and	O
also	O
placing	O
emphasis	O
on	O
internal	O
upgrades	O
such	O
as	O
upgraded	O
processor	O
and	O
an	O
updated	O
Android	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
The	O
S	O
Duos	O
3	O
has	O
a	O
1.0GHz	O
dual-core	B-Architecture
processor	I-Architecture
alongside	O
the	O
512	O
MB	O
RAM	B-Architecture
and	O
4	O
GB	O
internal	O
storage	O
(	O
only	O
2.1	O
GB	O
is	O
user	O
accessible	O
)	O
.	O
</s>
<s>
The	O
S	O
Duos	O
3	O
has	O
a	O
4.0-inch	O
(	O
100.8mm	O
)	O
WVGA	O
TFT	B-Device
LCD	I-Device
display	O
with	O
480x800	O
pixels	O
resolution	O
and	O
233	O
ppi	B-Algorithm
pixel	B-Algorithm
density	I-Algorithm
,	O
which	O
is	O
the	O
same	O
as	O
that	O
of	O
the	O
S	O
Duos	O
2	O
,	O
but	O
does	O
not	O
allow	O
for	O
automatic	O
brightness	O
and	O
gamut	O
adjustments	O
due	O
to	O
lacking	O
an	O
ambient	O
sensor	O
unlike	O
its	O
predecessor	O
.	O
</s>
<s>
It	O
lacks	O
a	O
proximity	B-Device
sensor	I-Device
.	O
</s>
<s>
Unlike	O
entry-level	O
dual	O
SIM	O
models	O
from	O
Samsung	B-Application
,	O
the	O
S	O
Duos	O
3	O
is	O
active	O
on	O
both	O
SIMs	O
all	O
the	O
time	O
similar	O
to	O
the	O
S	O
Duos	O
2	O
;	O
so	O
it	O
is	O
ready	O
to	O
receive	O
calls	O
on	O
either	O
SIM	O
when	O
a	O
call	O
is	O
not	O
already	O
in	O
progress	O
.	O
</s>
<s>
A	O
limitation	O
of	O
the	O
phone	O
is	O
that	O
only	O
one	O
SIM	O
can	O
be	O
active	O
on	O
UMTS	B-Protocol
(	O
and	O
therefore	O
data	O
)	O
at	O
a	O
time	O
and	O
so	O
it	O
may	O
be	O
unsuitable	O
for	O
certain	O
combinations	O
of	O
networks	O
.	O
</s>
<s>
The	O
S	O
Duos	O
3	O
ships	O
with	O
Android	B-Application
4.4.2	I-Application
KitKat	I-Application
and	O
Samsung	B-Application
's	O
updated	O
TouchWiz	B-Application
Essence	I-Application
UX	I-Application
user	O
interface	O
.	O
</s>
<s>
The	O
S	O
Duos	O
3	O
adds	O
some	O
of	O
the	O
features	O
of	O
the	O
Galaxy	B-Application
S4	I-Application
such	O
as	O
Samsung	B-Application
proprietary	O
widgets	O
used	O
by	O
models	O
bearing	O
the	O
same	O
version	O
of	O
the	O
OS	O
.	O
</s>
<s>
Custom	O
ROMs	O
such	O
as	O
AOSP	O
5.1	O
and	O
CyanogenMod	B-Application
12.1	I-Application
by	O
itigr	O
,	O
are	O
available	O
for	O
updating	O
to	O
Android	B-Application
5.1.1	I-Application
Lollipop	B-Application
.	O
</s>
