<s>
The	O
Xiaomi	B-Application
Redmi	I-Application
Note	I-Application
4	I-Application
is	O
the	O
fourth	O
smartphone	B-Application
under	O
the	O
Redmi	B-Application
Note	O
series	O
developed	O
by	O
Xiaomi	O
Inc	O
.	O
</s>
<s>
It	O
is	O
a	O
part	O
of	O
Xiaomi	O
's	O
budget	O
Redmi	B-Application
smartphone	B-Application
lineup	O
.	O
</s>
<s>
It	O
has	O
two	O
variants	O
:	O
The	O
older	O
version	O
sold	O
as	O
Redmi	B-Application
Note	I-Application
4	I-Application
is	O
powered	O
by	O
a	O
Deca-core	B-Architecture
Mediatek	B-Architecture
MT6797	O
Helio	O
X20	O
SOC	B-Architecture
.	O
</s>
<s>
The	O
upgraded	O
version	O
,	O
sold	O
both	O
as	O
Redmi	B-Application
Note	O
4X	O
and	O
Redmi	B-Application
Note	I-Application
4	I-Application
(	O
where	O
MTK	O
version	O
was	O
not	O
released	O
)	O
is	O
powered	O
by	O
an	O
Octa-core	B-Architecture
MSM8953	O
Qualcomm	B-Architecture
Snapdragon	I-Architecture
625	O
SoC	B-Architecture
.	O
</s>
<s>
The	O
Redmi	B-Application
Note	I-Application
4	I-Application
was	O
succeeded	O
by	O
Redmi	B-Application
Note	I-Application
5	I-Application
.	O
</s>
<s>
In	O
January	O
2017	O
,	O
the	O
Snapdragon	B-Architecture
version	O
of	O
the	O
Xiaomi	B-Application
Redmi	I-Application
Note	I-Application
4	I-Application
or	O
Xiaomi	B-Application
Redmi	I-Application
Note	I-Application
4X	I-Application
became	O
the	O
company	O
's	O
first	O
major	O
launch	O
.	O
</s>
<s>
It	O
came	O
with	O
2GB	O
RAM	B-Architecture
+	O
32GB	O
eMMC	O
,	O
3GB	O
RAM	B-Architecture
+	O
16	O
or	O
32GB	O
eMMC	O
and	O
4GB	O
RAM	B-Architecture
+	O
64GB	O
eMMC	O
variants	O
.	O
</s>
<s>
The	O
phone	O
sports	O
a	O
5.5-inch	O
Full	O
HD	O
IPS	B-Architecture
display	I-Architecture
(	O
1080	O
x	O
1920	O
resolution	O
)	O
,	O
translating	O
to	O
a	O
pixel	B-Algorithm
density	I-Algorithm
of	O
401ppi	O
.	O
</s>
<s>
On	O
February	O
the	O
14th	O
2017	O
,	O
alongside	O
the	O
Chinese	O
release	O
of	O
the	O
Redmi	B-Application
Note	O
4X	O
,	O
Xiaomi	O
released	O
a	O
limited	O
edition	O
set	O
of	O
the	O
phone	O
featuring	O
Hatsune	O
Miku	O
.	O
</s>
<s>
In	O
October	O
2017	O
,	O
Lei	O
Jun	O
announced	O
that	O
the	O
sales	O
of	O
Redmi	B-Application
Note	O
4X	O
exceeded	O
20	O
million	O
units	O
globally	O
and	O
its	O
reputation	O
was	O
good	O
.	O
</s>
<s>
The	O
company	O
announced	O
that	O
as	O
many	O
as	O
9,624,110	O
units	O
of	O
Redmi	B-Application
Note	I-Application
4	I-Application
were	O
sold	O
in	O
India	O
in	O
2017	O
and	O
that	O
it	O
was	O
one	O
of	O
their	O
best-selling	O
smartphones	B-Application
in	O
the	O
last	O
quarter	O
of	O
2017	O
.	O
</s>
<s>
The	O
company	O
discontinued	O
the	O
smartphone	B-Application
's	O
sale	O
in	O
favor	O
of	O
the	O
successors	O
Redmi	B-Application
5	O
and	O
Redmi	B-Application
Note	I-Application
5	I-Application
.	O
</s>
<s>
Xiaomi	B-Application
Redmi	I-Application
Note	I-Application
4	I-Application
MTK	O
(	O
codename	O
nikel	O
)	O
is	O
equipped	O
with	O
MediaTek	B-Architecture
MT6796	O
Helio	O
X20	O
CPU	O
and	O
Mali-T880	O
MP4	O
GPU	O
.	O
</s>
<s>
It	O
runs	O
MIUI	B-Protocol
8	O
,	O
(	O
updated	O
to	O
MIUI	B-Protocol
9.6	O
)	O
based	O
on	O
Android	B-Application
6.0	I-Application
.	O
</s>
<s>
The	O
Global	O
4	O
or	O
4X	O
variant	O
(	O
SD	O
-	O
codename	O
mido	O
)	O
uses	O
Qualcomm	O
's	O
Octa-core	B-Architecture
2.0GHz	O
Snapdragon	B-Architecture
625	O
CPU	O
and	O
Adreno	B-General_Concept
506	O
GPU	O
.	O
</s>
<s>
All	O
variants	O
included	O
an	O
1080p	O
display	O
,	O
2	O
,	O
3	O
or	O
4	O
GB	O
of	O
RAM	B-Architecture
,	O
16	O
,	O
32	O
or	O
64	O
GB	O
eMMC	O
5.1	O
Flash	O
storage	O
,	O
a	O
5MP	O
front	O
camera	O
,	O
non-removable	O
4100	O
mAh	O
Li-Po	O
battery	O
and	O
it	O
supports	O
Wi-Fi	O
802.11a/b/g/n/ac	O
*	O
( *	O
=	O
Wi-Fi	O
802.11	O
ac	O
band	O
is	O
supported	O
on	O
MTK	O
variant	O
only	O
)	O
networks	O
on	O
both	O
the	O
2.4	O
and	O
5GHz	O
bands	O
.	O
</s>
<s>
Phones	O
also	O
support	O
hybrid	O
SIM	O
and	O
Memory	O
Card	O
configuration	O
in	O
which	O
the	O
user	O
can	O
have	O
either	O
two	O
SIM	O
cards	O
or	O
a	O
SIM	O
card	O
+	O
microSDHC	B-Device
card	I-Device
at	O
one	O
time	O
because	O
one	O
SIM	O
card	O
and	O
the	O
microSDHC	B-Device
card	I-Device
share	O
the	O
same	O
physical	O
tray	O
slot	O
.	O
</s>
<s>
The	O
device	O
also	O
comes	O
equipped	O
with	O
an	O
RGB	O
Notification	B-Application
LED	I-Application
light	O
and	O
is	O
recognized	O
as	O
one	O
of	O
the	O
last	O
phones	O
by	O
Xiaomi	O
to	O
have	O
an	O
RGB	O
light	O
instead	O
of	O
the	O
monochromatic	O
White	O
color	O
notification	B-Application
LED	I-Application
used	O
in	O
devices	O
launched	O
thereafter	O
.	O
</s>
<s>
The	O
Redmi	B-Application
Note	O
4X	O
does	O
not	O
have	O
this	O
pair	O
of	O
screws	O
.	O
</s>
<s>
Also	O
,	O
the	O
Redmi	B-Application
Note	I-Application
4	I-Application
(	O
MTK	O
)	O
has	O
a	O
full	O
metal	O
body	O
whereas	O
the	O
Global	O
and	O
Snapdragon	B-Architecture
variants	O
of	O
the	O
phone	O
have	O
an	O
anodized	O
aluminum	O
body	O
with	O
plastic	O
inserts	O
at	O
the	O
top	O
and	O
bottom	O
for	O
better	O
signal	O
reception	O
.	O
</s>
<s>
The	O
global	O
variant	O
also	O
does	O
not	O
have	O
the	O
diamond	O
cut	O
finish	O
found	O
on	O
the	O
MediaTek	B-Architecture
variant	O
of	O
the	O
phone	O
.	O
</s>
<s>
On	O
launch	O
,	O
it	O
ran	O
MIUI	B-Protocol
8	O
based	O
on	O
Android	B-Application
6.0	I-Application
,	O
which	O
was	O
updated	O
to	O
MIUI	B-Protocol
10.2	O
based	O
on	O
Android	B-Application
7.0	I-Application
for	O
Snapdragon	B-Architecture
devices	O
.	O
</s>
<s>
Purchasing	O
a	O
Redmi	B-Application
Note	I-Application
4	I-Application
Snapdragon	B-Architecture
variant	O
now	O
will	O
be	O
running	O
MIUI	B-Protocol
8	O
based	O
on	O
Android	B-Application
6.0.1	I-Application
instead	O
of	O
Android	B-Application
6.0	I-Application
.	O
</s>
<s>
The	O
Global	O
Snapdragon	B-Architecture
Edition	O
of	O
the	O
device	O
is	O
slated	O
to	O
receive	O
MIUI	B-Protocol
11	I-Protocol
update	O
based	O
on	O
Android	B-Application
7.0	I-Application
in	O
November	O
2019	O
.	O
</s>
<s>
The	O
MediaTek	B-Architecture
edition	O
,	O
however	O
,	O
runs	O
on	O
MIUI	B-Protocol
10	I-Protocol
based	O
on	O
Android	B-Application
6.0	I-Application
.	O
</s>
<s>
The	O
Sailfish	B-Operating_System
OS	I-Operating_System
was	O
ported	O
on	O
a	O
Qualcomm	O
version	O
of	O
Note	O
4	O
.	O
</s>
<s>
Through	O
Custom	B-Application
Roms	I-Application
,	O
Android	O
versions	O
upto	O
Android	B-Application
13	I-Application
is	O
available	O
for	O
Note	O
4	O
.	O
</s>
<s>
It	O
is	O
one	O
of	O
the	O
most	O
widely	O
supported	O
phone	O
in	O
custom	B-Application
Rom	I-Application
community	O
.	O
</s>
<s>
The	O
smartphone	B-Application
received	O
mostly	O
positive	O
feedback	O
upon	O
its	O
launch	O
because	O
of	O
its	O
great	O
battery	O
life	O
,	O
CPU	O
performance	O
,	O
good	O
thermal	O
performance	O
,	O
great	O
price-to-performance	O
ratio	O
and	O
a	O
great	O
day-to-day	O
performance	O
.	O
</s>
<s>
GSMArena	O
states	O
:	O
"	O
The	O
Redmi	O
Note	O
4(X )	O
'	O
s	O
Snapdragon	B-Architecture
625	O
,	O
which	O
we	O
consider	O
to	O
be	O
the	O
ultimate	O
mid-range	O
chipset	O
for	O
this	O
generation	O
,	O
provides	O
excellent	O
performance	O
with	O
great	O
power	O
efficiency	O
and	O
thermal	O
properties	O
.	O
</s>
<s>
The	O
battery	O
life	O
of	O
this	O
phone	O
is	O
jaw-dropping	O
,	O
the	O
MIUI	B-Protocol
experience	O
is	O
smooth	O
,	O
and	O
the	O
camera	O
does	O
well	O
in	O
all	O
occasions	O
.	O
</s>
<s>
Also	O
,	O
in	O
GSMArena	O
's	O
device	O
review	O
,	O
the	O
Snapdragon	B-Architecture
edition	O
of	O
the	O
phone	O
scored	O
much	O
better	O
than	O
the	O
specified	O
figures	O
,	O
getting	O
a	O
1500:1	O
Contrast	O
ratio	O
,	O
484nits	O
of	O
maximum	O
luminance	O
and	O
excellent	O
colour	O
accuracy	O
for	O
the	O
class	O
.	O
</s>
<s>
According	O
to	O
AndroidAuthority	O
:	O
"	O
The	O
Redmi	O
Note	O
4(X )	O
is	O
not	O
perfect	O
,	O
but	O
it	O
is	O
a	O
well-rounded	O
package	O
that	O
one	O
would	O
n’t	O
hesitate	O
to	O
recommend	O
to	O
anyone	O
looking	O
for	O
a	O
budget	O
or	O
mid-range	O
smartphone	B-Application
.	O
</s>
<s>
Packed	O
in	O
a	O
neat	O
chassis	O
,	O
the	O
smartphone	B-Application
performs	O
great	O
and	O
is	O
a	O
compelling	O
value-for-money	O
smartphone.	O
"	O
</s>
<s>
AndroidCentral	O
also	O
considered	O
Redmi	O
Note	O
4(SD variant )	O
to	O
be	O
one	O
of	O
the	O
best	O
smartphones	B-Application
one	O
can	O
buy	O
in	O
the	O
mid-budget	O
range	O
even	O
after	O
6	O
months	O
of	O
launch	O
.	O
</s>
<s>
TechRadar	O
called	O
Redmi	B-Application
Note	I-Application
4	I-Application
to	O
be	O
an	O
overall	O
impressive	O
device	O
overall	O
,	O
though	O
lacking	O
the	O
X	O
factor	O
,	O
getting	O
4/5	O
ratings	O
.	O
</s>
<s>
Initially	O
,	O
upon	O
launch	O
,	O
it	O
was	O
not	O
received	O
as	O
the	O
true	O
successor	O
of	O
the	O
Redmi	O
Note	O
3(Snapdragon Variant )	O
mostly	O
because	O
of	O
the	O
use	O
of	O
the	O
Snapdragon	B-Architecture
625	O
as	O
opposed	O
to	O
the	O
Snapdragon	B-Architecture
650	O
in	O
Redmi	B-Application
Note	I-Application
3	I-Application
in	O
terms	O
of	O
the	O
RAW	O
performance	O
of	O
the	O
CPU	O
and	O
GPU	O
.	O
</s>
<s>
Though	O
perceived	O
initially	O
as	O
a	O
theoretical	O
downgrade	O
by	O
media	O
,	O
XDA	O
Developers	O
also	O
considered	O
the	O
device	O
an	O
upgrade	O
to	O
Redmi	B-Application
Note	I-Application
3	I-Application
,	O
citing	O
its	O
overall	O
sustained	O
performance	O
,	O
on	O
par	O
day	O
to	O
day	O
performance	O
and	O
better	O
battery	O
and	O
thermal	O
performance	O
by	O
a	O
good	O
margin	O
.	O
</s>
<s>
The	O
new	O
Snapdragon	B-Architecture
625	O
was	O
well	O
received	O
by	O
users	O
as	O
well	O
as	O
reviewers	O
after	O
using	O
the	O
device	O
for	O
a	O
while	O
owing	O
to	O
the	O
better	O
fabrication	O
process	O
,	O
battery	O
life	O
and	O
thermal	O
efficiency	O
of	O
the	O
new	O
chipset	O
over	O
the	O
Snapdragon	B-Architecture
650	O
.	O
</s>
