<s>
The	O
Phab	O
2	O
Pro	O
is	O
an	O
Android	B-Application
smartphone	B-Application
in	O
a	O
phablet	B-Application
form	O
factor	O
,	O
developed	O
and	O
produced	O
by	O
Lenovo	O
and	O
first	O
released	O
in	O
November	O
of	O
2016	O
at	O
an	O
MSRP	O
of	O
US$499	O
.	O
</s>
<s>
The	O
device	O
is	O
notable	O
for	O
being	O
the	O
first	O
consumer	O
smartphone	B-Application
to	O
support	O
Google	B-Algorithm
Tango	I-Algorithm
augmented	B-General_Concept
reality	I-General_Concept
(	O
AR	O
)	O
technology	O
.	O
</s>
<s>
The	O
Phab	O
2	O
Pro	O
features	O
a	O
Qualcomm	B-Architecture
Snapdragon	I-Architecture
652	O
system-on-chip	B-Architecture
(	O
SoC	O
)	O
,	O
which	O
Lenovo	O
claims	O
to	O
be	O
specially	O
optimized	O
for	O
Tango	B-Algorithm
.	O
</s>
<s>
In	O
addition	O
,	O
it	O
contains	O
4	O
GB	O
of	O
LPDDR3	O
RAM	O
and	O
64GB	O
of	O
onboard	O
storage	O
,	O
expandable	O
with	O
a	O
microSD	B-Device
slot	O
supporting	O
up	O
to	O
256	O
GB	O
.	O
</s>
<s>
In	O
the	O
United	O
States	O
,	O
the	O
Phab	O
2	O
Pro	O
supports	O
the	O
networks	O
of	O
carriers	O
AT&T	O
and	O
T-Mobile	O
(	O
and	O
MVNOs	O
using	O
the	O
networks	O
of	O
those	O
companies	O
)	O
,	O
but	O
not	O
those	O
operated	O
by	O
Verizon	B-Application
or	O
Sprint	O
(	O
or	O
MVNOs	O
using	O
the	O
networks	O
of	O
those	O
companies	O
)	O
.	O
</s>
<s>
The	O
device	O
uses	O
a	O
nano-SIM	O
for	O
network	O
connectivity	O
,	O
with	O
dual-SIM	O
functionality	O
available	O
if	O
the	O
user	O
forgoes	O
the	O
use	O
of	O
a	O
microSD	B-Device
card	O
.	O
</s>
<s>
The	O
Phab	O
2	O
Pro	O
's	O
screen	O
is	O
an	O
IPS	B-Architecture
LCD	I-Architecture
at	O
a	O
display	O
resolution	O
of	O
2560x1440	O
pixels	O
,	O
with	O
459	O
ppi	B-Algorithm
pixel	B-Algorithm
density	I-Algorithm
at	O
a	O
diagonal	O
size	O
of	O
6.4	O
inches	O
.	O
</s>
<s>
This	O
makes	O
the	O
screen	O
unusually	O
large	O
for	O
a	O
smartphone	B-Application
class	O
device	O
,	O
as	O
most	O
mainstream	O
smartphones	B-Application
at	O
the	O
time	O
of	O
the	O
Phab	O
2	O
Pro	O
's	O
release	O
(	O
Google	O
Pixel	O
XL	O
,	O
Samsung	B-Application
Galaxy	I-Application
S7	I-Application
edge	I-Application
,	O
iPhone	B-Application
7	I-Application
Plus	I-Application
among	O
others	O
)	O
measured	O
at	O
or	O
under	O
5.5	O
"	O
diagonally	O
.	O
</s>
<s>
However	O
,	O
the	O
Google	B-Algorithm
Tango	I-Algorithm
reference	O
implementation	O
was	O
a	O
7-inch	O
tablet	O
,	O
so	O
it	O
has	O
been	O
argued	O
that	O
Lenovo	O
's	O
hardware	O
is	O
relatively	O
small	O
.	O
</s>
<s>
The	O
hardware	O
focus	O
of	O
the	O
is	O
the	O
camera	O
and	O
sensor	O
system	O
on	O
the	O
back	O
of	O
the	O
phone	O
that	O
enables	O
Tango	B-Algorithm
,	O
encompassing	O
a	O
depth	B-Algorithm
sensor	I-Algorithm
and	O
motion	O
sensor	O
in	O
addition	O
to	O
the	O
16-megapixel	O
main	O
camera	O
.	O
</s>
<s>
Working	O
in	O
tandem	O
,	O
the	O
three	O
sensors	O
combine	O
with	O
Google	O
's	O
Tango	B-Algorithm
software	B-Application
API	I-Application
to	O
offer	O
functionality	O
such	O
as	O
accurate	O
digital	O
measurement	O
of	O
three-dimensional	O
objects	O
,	O
to-scale	O
realistic	O
simulation	O
of	O
furniture	O
and	O
other	O
objects	O
in	O
a	O
real-life	O
space	O
,	O
and	O
AR-augmented	O
video	O
games	O
.	O
</s>
<s>
Audio	O
can	O
be	O
played	O
back	O
through	O
a	O
3.5mm	O
audio	O
jack	O
,	O
over	O
Bluetooth	B-Protocol
,	O
or	O
with	O
the	O
device	O
's	O
single	O
bottom-firing	O
loudspeaker	O
.	O
</s>
<s>
The	O
Phab	O
2	O
Pro	O
features	O
a	O
rear-mounted	O
circular	O
fingerprint	B-Algorithm
sensor	O
,	O
which	O
can	O
be	O
used	O
to	O
securely	O
unlock	O
the	O
device	O
,	O
but	O
not	O
to	O
authorize	O
mobile	O
payments	O
due	O
to	O
the	O
device	O
lacking	O
NFC	O
functionality	O
.	O
</s>
<s>
The	O
Phab	O
2	O
Pro	O
's	O
design	O
encompasses	O
a	O
glass	O
display	O
flanked	O
by	O
aluminum	O
upper	O
and	O
lower	O
bezels	O
,	O
with	O
the	O
lower	O
bezel	O
housing	O
three	O
capacitive	O
navigation	O
buttons	O
(	O
the	O
Android	B-Application
standard	O
of	O
back	O
,	O
home	O
,	O
and	O
recent	O
apps	O
,	O
from	O
left	O
to	O
right	O
)	O
,	O
and	O
the	O
upper	O
bezel	O
housing	O
a	O
telephone	O
loudspeaker	O
for	O
calls	O
,	O
an	O
8-megapixel	O
front-facing	O
camera	O
,	O
and	O
a	O
light	O
sensor	O
and	O
proximity	B-Device
sensor	I-Device
.	O
</s>
<s>
The	O
back	O
and	O
sides	O
of	O
the	O
phone	O
are	O
aluminum	O
,	O
with	O
glass	O
camera	O
and	O
sensor	O
covers	O
and	O
two	O
plastic	O
antenna	O
lines	O
on	O
the	O
top	O
and	O
bottom	O
;	O
the	O
cameras	O
and	O
sensors	O
protrude	O
slightly	O
from	O
the	O
back	O
itself	O
,	O
which	O
features	O
a	O
slight	O
curve	O
similar	O
to	O
that	O
found	O
on	O
the	O
Nexus	B-Device
6	I-Device
.	O
</s>
<s>
The	O
main	O
camera	O
is	O
topmost	O
on	O
the	O
back	O
,	O
followed	O
by	O
the	O
depth	B-Algorithm
sensor	I-Algorithm
,	O
both	O
of	O
which	O
are	O
housed	O
in	O
a	O
vertical	O
pill-shaped	O
protrusion	O
with	O
a	O
glass	O
covering	O
.	O
</s>
<s>
Below	O
the	O
main	O
camera	O
and	O
depth	B-Algorithm
sensor	I-Algorithm
housing	O
is	O
the	O
circular	O
motion	O
sensor	O
,	O
immediately	O
below	O
which	O
is	O
the	O
fingerprint	B-Algorithm
sensor	O
.	O
</s>
<s>
The	O
left	O
side	O
of	O
the	O
phone	O
(	O
from	O
the	O
front	O
)	O
houses	O
a	O
two-button	O
volume	O
rocker	O
above	O
a	O
power	O
button	O
,	O
while	O
the	O
right	O
side	O
houses	O
the	O
ejectable	O
SIM/microSD	O
tray	O
.	O
</s>
<s>
The	O
Phab	O
2	O
Pro	O
runs	O
a	O
lightly	O
customized	O
version	O
of	O
Android	B-Application
6.0	I-Application
"	I-Application
Marshmallow	I-Application
,	I-Application
"	I-Application
in	O
addition	O
to	O
the	O
Google	B-Algorithm
Tango	I-Algorithm
front-end	O
applications	O
and	O
a	O
Dolby	O
Atmos	O
application	O
.	O
</s>
<s>
The	O
device	O
received	O
praise	O
for	O
its	O
innovation	O
in	O
the	O
AR	O
field	O
and	O
successful	O
implementation	O
of	O
the	O
Tango	B-Algorithm
protocol	O
,	O
although	O
reviewers	O
noted	O
that	O
actual	O
Tango	B-Algorithm
software	O
was	O
extremely	O
taxing	O
on	O
the	O
phone	O
's	O
battery	O
and	O
certain	O
high-intensity	O
Tango	B-Algorithm
applications	O
did	O
not	O
run	O
smoothly	O
due	O
to	O
the	O
arguably	O
mid-range	O
processor	O
.	O
</s>
<s>
The	O
device	O
size	O
was	O
divisive	O
in	O
particular	O
,	O
with	O
some	O
reviewers	O
claiming	O
it	O
was	O
well-executed	O
and	O
necessary	O
to	O
support	O
Tango	B-Algorithm
in	O
a	O
smartphone	B-Application
platform	O
,	O
while	O
others	O
said	O
that	O
it	O
was	O
altogether	O
too	O
unwieldy	O
for	O
the	O
majority	O
of	O
users	O
.	O
</s>
