<s>
The	O
Samsung	B-Application
Galaxy	I-Application
A31	I-Application
is	O
a	O
mid-range	O
Android	B-Application
smartphone	B-Application
developed	O
by	O
Samsung	B-Application
Electronics	O
as	O
part	O
of	O
their	O
2020	O
A-series	B-Application
smartphone	B-Application
lineup	O
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
March	O
24	O
,	O
2020	O
,	O
and	O
first	O
released	O
on	O
April	O
27	O
,	O
2020	O
,	O
as	O
the	O
successor	O
to	O
the	O
Galaxy	B-Application
A30	I-Application
and	O
A30s	O
.	O
</s>
<s>
The	O
phone	O
comes	O
preinstalled	O
with	O
Android	B-Application
10	I-Application
and	O
Samsung	B-Application
's	O
custom	O
One	B-Application
UI	I-Application
2.1	I-Application
software	O
overlay.The	O
display	O
User	O
Interface	O
from	O
Samsung	B-Application
Galaxy	I-Application
A31	I-Application
is	O
Infinity-U	O
.	O
</s>
<s>
The	O
Samsung	B-Application
Galaxy	I-Application
A31	I-Application
is	O
a	O
plastic	O
build	O
with	O
a	O
glass	O
front	O
.	O
</s>
<s>
The	O
phone	O
's	O
6.4-inch	O
,	O
FHD	O
Super	B-Algorithm
AMOLED	I-Algorithm
panel	O
has	O
a	O
screen-to-body	O
ratio	O
of	O
84.9	O
%	O
and	O
an	O
aspect	B-Device
ratio	I-Device
of	O
20:9	O
to	O
match	O
that	O
of	O
other	O
Samsung	B-Operating_System
phones	I-Operating_System
sold	O
in	O
2020	O
.	O
</s>
<s>
An	O
optical	O
,	O
under-display	O
fingerprint	O
reader	O
replaces	O
the	O
rear-mounted	O
one	O
seen	O
on	O
the	O
previous	O
A30	B-Application
models	I-Application
.	O
</s>
<s>
The	O
new	O
L-shaped	O
rear	O
camera	O
system	O
(	O
similar	O
to	O
the	O
ones	O
seen	O
on	O
newer	O
Samsung	B-Operating_System
phones	I-Operating_System
)	O
utilizes	O
four	O
cameras	O
,	O
a	O
48	O
MP	O
main	O
sensor	O
with	O
an	O
f/2.0	O
aperture	B-General_Concept
,	O
an	O
8	O
MP	O
ultra-wide	O
lens	O
with	O
a	O
123°	O
field	O
of	O
view	O
and	O
a	O
5	O
MP	O
macro	O
and	O
depth	O
camera	O
,	O
both	O
with	O
an	O
f/2.4	O
aperture	B-General_Concept
.	O
</s>
<s>
The	O
phone	O
comes	O
with	O
Android	B-Application
10	I-Application
and	O
Samsung	B-Application
's	O
custom	O
One	B-Application
UI	I-Application
2.1	I-Application
software	O
overlay	O
.	O
</s>
<s>
Depending	O
on	O
the	O
region	O
,	O
it	O
can	O
support	O
contactless	B-Application
NFC	I-Application
payments	I-Application
through	O
Samsung	B-Application
Pay	I-Application
and	O
other	O
various	O
payment	O
apps	O
that	O
can	O
be	O
installed	O
separately	O
.	O
</s>
<s>
Software	O
experience	O
is	O
comparable	O
to	O
that	O
of	O
other	O
2020	O
Samsung	B-Application
devices	O
,	O
and	O
it	O
boasts	O
many	O
of	O
the	O
software	O
perks	O
costlier	O
Samsung	B-Application
devices	O
boast	O
,	O
such	O
as	O
Edge	O
Screen	O
and	O
Edge	O
Lighting	O
.	O
</s>
<s>
As	O
with	O
most	O
other	O
Samsung	B-Operating_System
phones	I-Operating_System
released	O
during	O
2020	O
,	O
the	O
Microsoft-Samsung	O
partnership	O
Link	B-Application
to	I-Application
Windows	I-Application
option	O
which	O
comes	O
as	O
standard	O
,	O
can	O
be	O
accessed	O
in	O
the	O
Android	B-Application
notification	O
panel	O
.	O
</s>
<s>
Banking	O
on	O
Samsung	B-Application
's	O
latest	O
software	O
update	O
schedule	O
,	O
the	O
phone	O
should	O
be	O
eligible	O
for	O
two	O
major	O
Android	B-Application
upgrades	O
.	O
</s>
<s>
The	O
A31	O
has	O
got	O
the	O
Android	B-Application
11	I-Application
update	O
with	O
One	B-Application
UI	I-Application
3.1	O
at	O
May	O
,	O
but	O
it	O
may	O
vary	O
at	O
other	O
regions	O
around	O
the	O
world	O
.	O
</s>
<s>
In	O
August	O
2021	O
,	O
Samsung	B-Application
gradually	O
rolled	O
out	O
a	O
major	O
security	O
update	O
to	O
the	O
A31	O
.	O
</s>
<s>
The	O
Samsung	B-Application
Galaxy	I-Application
A31	I-Application
received	O
mixed	O
reviews	O
with	O
most	O
reviewers	O
acclaiming	O
the	O
brilliant	O
screen	O
,	O
excellent	O
battery	O
life	O
,	O
software	O
and	O
overall	O
build	O
quality	O
.	O
</s>
<s>
Reviewers	O
were	O
also	O
reluctant	O
to	O
recommend	O
the	O
device	O
considering	O
that	O
even	O
in	O
Samsung	B-Application
's	O
own	O
mid-range	O
A-series	B-Application
one	O
could	O
get	O
a	O
better	O
overall	O
package	O
by	O
spending	O
just	O
a	O
little	O
more	O
money	O
.	O
</s>
