<s>
The	O
Microsoft	B-Device
Lumia	I-Device
950	I-Device
XL	I-Device
(	O
codenamed	O
Cityman	O
,	O
a	O
reference	O
to	O
the	O
old	O
Nokia	O
Cityman	O
)	O
is	O
a	O
smartphone	O
developed	O
by	O
Microsoft	O
,	O
officially	O
revealed	O
on	O
October	O
6	O
,	O
2015	O
and	O
released	O
on	O
November	O
20	O
,	O
2015	O
alongside	O
the	O
smaller	O
Lumia	B-Application
950	I-Application
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
is	O
the	O
successor	O
to	O
the	O
Nokia	B-Application
Lumia	I-Application
1520	I-Application
and	O
is	O
among	O
the	O
first	O
phones	O
to	O
natively	O
run	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
has	O
a	O
polycarbonate	O
frame	O
with	O
a	O
removable	O
back	O
shell	O
,	O
allowing	O
access	O
to	O
the	O
battery	O
as	O
well	O
as	O
SIM	O
and	O
microSD	O
card	O
slots	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
uses	O
a	O
Qualcomm	O
Snapdragon	O
810	O
MSM8994	O
SoC	B-Architecture
which	O
combines	O
four	O
2GHz	O
Cortex-A57	O
and	O
four	O
1.5GHz	O
Cortex-A53	O
cores	O
in	O
a	O
big.LITTLE	B-Architecture
architecture	O
,	O
allowing	O
more	O
computationally	O
intensive	O
workloads	O
to	O
run	O
on	O
the	O
faster	O
"	O
big	O
"	O
cores	O
while	O
threads	O
with	O
less	O
priority	O
run	O
on	O
the	O
slower	O
"	O
LITTLE	O
"	O
cores	O
.	O
</s>
<s>
The	O
SoC	B-Architecture
also	O
includes	O
an	O
Adreno	B-General_Concept
430	O
GPU	O
and	O
is	O
cooled	O
by	O
a	O
heat	O
pipe	O
that	O
dissipates	O
heat	O
inside	O
the	O
phone	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
has	O
a	O
AMOLED	B-Algorithm
display	I-Algorithm
with	O
a	O
resolution	O
of	O
2560x1440	O
(	O
WQHD	O
)	O
and	O
a	O
16:9	O
aspect	B-General_Concept
ratio	I-General_Concept
.	O
</s>
<s>
Pixel	B-Algorithm
density	I-Algorithm
is	O
518ppi	O
.	O
</s>
<s>
The	O
display	O
is	O
protected	O
by	O
Gorilla	O
Glass	O
4	O
and	O
features	O
ClearBlack	O
technology	O
for	O
improved	O
sunlight	O
visibility	O
,	O
as	O
well	O
as	O
double	O
tap	O
to	O
wake	O
,	O
but	O
unlike	O
earlier	O
Lumia	B-Device
flagships	O
it	O
does	O
not	O
support	O
some	O
features	O
like	O
Super	O
Sensitive	O
touch	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
has	O
a	O
20MP	O
PureView-branded	O
rear-facing	O
camera	O
,	O
containing	O
a	O
1/2.4in	O
BSI	B-Algorithm
sensor	O
with	O
1.12μm	O
pixels	O
and	O
phase-detection	O
autofocus	O
,	O
a	O
6-element	O
Carl	O
Zeiss	O
lens	O
with	O
a	O
f/1.9	O
aperture	B-General_Concept
and	O
5th-gen	O
optical	O
image	O
stabilization	O
,	O
and	O
a	O
triple-LED	O
RGB	O
flash	O
that	O
can	O
adjust	O
to	O
match	O
the	O
color	O
of	O
ambient	O
light	O
.	O
</s>
<s>
Maximum	O
image	O
resolution	O
is	O
4992x3744	O
pixels	O
(	O
18.7MP	O
)	O
in	O
4:3	O
aspect	B-General_Concept
ratio	I-General_Concept
and	O
5344x3008	O
pixels	O
(	O
16.1MP	O
)	O
in	O
16:9	O
aspect	B-General_Concept
ratio	I-General_Concept
.	O
</s>
<s>
The	O
camera	O
can	O
also	O
capture	O
oversampled	O
8MP	O
images	O
,	O
optionally	O
with	O
a	O
full-resolution	O
DNG	B-Application
file	I-Application
that	O
enables	O
more	O
post-processing	O
possibilities	O
.	O
</s>
<s>
The	O
camera	O
supports	O
video	O
capture	O
at	O
up	O
to	O
4K	B-Architecture
(	O
3840x2160	O
)	O
resolution	O
,	O
as	O
well	O
as	O
slow-motion	O
video	O
at	O
120fps	O
,	O
albeit	O
at	O
a	O
reduced	O
resolution	O
of	O
720p	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
supports	O
4G	O
LTE	O
technology	O
with	O
maximum	O
transfer	O
speeds	O
of	O
300Mbit/s	O
(	O
150Mbit/s	O
for	O
the	O
dual-SIM	O
version	O
)	O
.	O
</s>
<s>
Other	O
wireless	O
connectivity	O
options	O
include	O
dual-band	O
Wi-Fi	O
802.11a/b/g/n/ac	O
,	O
Wi-Fi	B-Application
hotspot	I-Application
,	O
NFC	O
,	O
Bluetooth	B-Protocol
4.1	O
,	O
and	O
wireless	O
screen	O
projection	O
via	O
Miracast	O
.	O
</s>
<s>
Physical	O
connectors	O
include	O
a	O
3.5	O
mm	O
audio	B-Device
jack	I-Device
,	O
as	O
well	O
as	O
a	O
USB-C	O
connector	O
for	O
charging	O
and	O
data	O
transfer	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
supports	O
wireless	O
inductive	B-Application
charging	I-Application
using	O
the	O
Qi	O
standard	O
.	O
</s>
<s>
With	O
either	O
the	O
addition	O
of	O
a	O
Microsoft	B-Device
Display	I-Device
Dock	I-Device
or	O
by	O
connecting	O
to	O
a	O
Miracast	O
receiver	O
,	O
the	O
Lumia	B-Device
950	I-Device
XL	I-Device
is	O
compatible	O
with	O
Windows	O
Continuum	O
,	O
a	O
technology	O
that	O
allows	O
users	O
to	O
connect	O
their	O
devices	O
to	O
an	O
external	O
monitor	O
for	O
a	O
desktop-like	O
experience	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
originally	O
launched	O
with	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
Version	O
1511	O
.	O
</s>
<s>
Microsoft	O
released	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
Version	O
1607	O
(	O
Anniversary	O
Update	O
)	O
in	O
August	O
2016	O
,	O
Version	O
1703	O
(	O
Creators	O
Update	O
)	O
in	O
April	O
2017	O
and	O
Version	O
1709	O
(	O
Fall	O
Creators	O
Update	O
)	O
in	O
October	O
2017	O
.	O
</s>
<s>
Third-party	O
developers	O
have	O
managed	O
to	O
port	O
Windows	B-Operating_System
10	I-Operating_System
ARM	O
to	O
the	O
Lumia	B-Device
950	I-Device
XL	I-Device
,	O
enabling	O
the	O
phone	O
to	O
run	O
a	O
full	O
desktop	O
version	O
of	O
Windows	O
.	O
</s>
<s>
Linux	O
and	O
Android	B-Application
have	O
also	O
been	O
ported	O
,	O
but	O
not	O
all	O
hardware	O
features	O
are	O
working	O
in	O
these	O
alternate	O
operating	O
systems	O
.	O
</s>
<s>
The	O
Lumia	B-Device
950	I-Device
XL	I-Device
was	O
generally	O
well-received	O
,	O
with	O
most	O
reviewers	O
commending	O
the	O
high-end	O
specifications	O
and	O
camera	O
performance	O
,	O
but	O
finding	O
the	O
design	O
to	O
be	O
less	O
"	O
premium	O
"	O
than	O
competing	O
flagships	O
,	O
and	O
the	O
app	O
ecosystem	O
to	O
be	O
less	O
comprehensive	O
than	O
Android	B-Application
or	O
iOS	B-Application
.	O
</s>
<s>
GSMArena	O
gave	O
the	O
Lumia	B-Device
950	I-Device
XL	I-Device
a	O
very	O
favorable	O
review	O
,	O
praising	O
the	O
specifications	O
,	O
display	O
and	O
camera	O
,	O
and	O
commending	O
Microsoft	O
's	O
unification	O
of	O
the	O
UI	O
and	O
app	O
stores	O
of	O
Windows	B-Operating_System
10	I-Operating_System
on	O
mobile	O
and	O
desktop	O
devices	O
.	O
</s>
<s>
The	O
aesthetics	O
of	O
the	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
OS	O
were	O
also	O
criticized	O
,	O
although	O
the	O
universal	O
apps	O
and	O
Continuum	O
were	O
seen	O
as	O
promising	O
.	O
</s>
<s>
Hannah	O
Francis	O
of	O
The	O
Sydney	O
Morning	O
Herald	O
called	O
the	O
Lumia	B-Device
950	I-Device
XL	I-Device
"	O
different	O
,	O
but	O
not	O
in	O
a	O
good	O
way	O
"	O
,	O
commending	O
Microsoft	O
for	O
features	O
like	O
Continuum	O
but	O
criticizing	O
the	O
execution	O
.	O
</s>
<s>
Expert	O
Reviews	O
gave	O
the	O
Lumia	B-Device
950	I-Device
XL	I-Device
a	O
score	O
of	O
3/5	O
,	O
with	O
reviewer	O
Katharine	O
Byrne	O
finding	O
the	O
performance	O
disappointing	O
despite	O
high	O
specifications	O
.	O
</s>
