<s>
The	O
Microsoft	B-Application
Lumia	I-Application
640	I-Application
and	O
Microsoft	B-Application
Lumia	I-Application
640	I-Application
XL	O
are	O
Windows	B-Protocol
Phone	I-Protocol
smartphones	B-Application
developed	O
by	O
Microsoft	O
Mobile	O
.	O
</s>
<s>
Both	O
phones	O
were	O
announced	O
on	O
March	O
2	O
,	O
2015	O
,	O
and	O
are	O
the	O
successors	O
to	O
the	O
Nokia	B-Device
Lumia	I-Device
630	I-Device
series	I-Device
and	O
the	O
Lumia	B-Application
1320	I-Application
,	O
respectively	O
.	O
</s>
<s>
On	O
February	O
15	O
,	O
2016	O
,	O
Microsoft	O
announced	O
the	O
Lumia	B-Application
650	I-Application
,	O
the	O
Lumia	B-Application
640	I-Application
successor	O
,	O
with	O
improvements	O
like	O
device	O
encryption	O
,	O
an	O
AMOLED	B-Algorithm
display	I-Algorithm
,	O
and	O
16	O
GB	O
of	O
flash	O
storage	O
.	O
</s>
<s>
The	O
Lumia	B-Application
640	I-Application
and	O
640	O
XL	O
were	O
unveiled	O
at	O
Microsoft	O
's	O
event	O
at	O
the	O
Mobile	O
World	O
Congress	O
in	O
Barcelona	O
,	O
Spain	O
on	O
March	O
2	O
,	O
2015	O
.	O
</s>
<s>
The	O
Lumia	B-Application
640	I-Application
LTE	I-Application
has	O
U.S.	O
pricing	O
beginning	O
at	O
US$	O
179.99	O
,	O
while	O
the	O
Lumia	B-Application
640	I-Application
XL	I-Application
LTE	O
(	O
exclusive	O
to	O
AT&T	O
in	O
the	O
country	O
)	O
is	O
priced	O
at	O
US$	O
249.99	O
.	O
</s>
<s>
In	O
certain	O
countries	O
,	O
there	O
is	O
promotion	O
which	O
includes	O
a	O
16GB	O
or	O
32GB	O
SD	O
Memory	O
Card	O
for	O
purchasing	O
Lumia	B-Application
640	I-Application
and	O
640	O
XL	O
.	O
</s>
<s>
Despite	O
similar	O
names	O
and	O
model	O
codes	O
,	O
the	O
Microsoft	B-Application
Lumia	I-Application
640	I-Application
and	O
Microsoft	B-Application
Lumia	I-Application
640	I-Application
XL	O
are	O
distinct	O
devices	O
in	O
both	O
form	O
and	O
function	O
.	O
</s>
<s>
The	O
Lumia	B-Application
640	I-Application
comes	O
with	O
a	O
5-inch	O
HD	B-Device
IPS	B-Architecture
LCD	I-Architecture
display	O
with	O
Corning	O
Gorilla	O
Glass	O
3	O
protection	O
and	O
oleophobic	O
(	O
fingerprint-resistant	O
)	O
coating	O
.	O
</s>
<s>
It	O
is	O
powered	O
by	O
a	O
1.2GHz	O
quad-core	O
Qualcomm	O
Snapdragon	O
400	O
processor	O
,	O
1GB	O
RAM	B-Architecture
and	O
8GB	O
(	O
only	O
3GB	O
available	O
)	O
internal	O
storage	O
with	O
up	O
to	O
128GB	O
expandable	O
storage	O
via	O
microSD	O
cards	O
.	O
</s>
<s>
The	O
Microsoft	B-Application
Lumia	I-Application
640	I-Application
XL	O
is	O
the	O
larger	O
,	O
"	O
phablet	B-Application
"	O
-type	O
version	O
of	O
the	O
Lumia	B-Application
640	I-Application
,	O
with	O
a	O
5.7-inch	O
HD	B-Device
IPS	B-Architecture
LCD	I-Architecture
display	O
.	O
</s>
<s>
The	O
640	O
XL	O
is	O
equipped	O
with	O
the	O
same	O
basic	O
hardware	O
and	O
network	O
connectivity	O
specifications	O
as	O
the	O
Lumia	B-Application
640	I-Application
,	O
but	O
features	O
a	O
Zeiss-engineered	O
13MP	O
(	O
1/3.0	O
″	O
sensor	O
)	O
rear	O
camera	O
with	O
LED	O
flash	O
,	O
as	O
well	O
as	O
a	O
5MP	O
wide-angle	O
front-facing	O
camera	O
.	O
</s>
<s>
The	O
Lumia	B-Application
640	I-Application
and	O
Lumia	B-Application
640	I-Application
XL	I-Application
shipped	O
with	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
Update	O
2	O
(	O
through	O
the	O
Lumia	B-Device
Denim	O
software	O
package	O
)	O
,	O
and	O
both	O
phones	O
are	O
upgradable	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
.	O
</s>
<s>
Initially	O
in	O
the	O
United	O
States	O
,	O
the	O
Lumia	B-Application
640	I-Application
and	O
640	O
XL	O
were	O
offered	O
with	O
a	O
free	O
one-year	O
subscription	O
to	O
Microsoft	B-Operating_System
Office	I-Operating_System
365	I-Operating_System
.	O
</s>
