Xiaomi Redmi 3S review: Game of Iterations

Display

The Xiaomi Redmi 3S features a 5" 720p IPS screen, the same size and resolution available on the original Redmi 3, for a pixel density of 294ppi. That's near Retina-grade, enough for crisp images and sharp text.

Taking a closer look at it under our digital microscope reveals a standard RGB arrangement of the sub-pixels that make up the Xiaomi Redmi 3S LCD panel.

Unfortunately, there is still no information on the protective coating, and there is a good chance it doesn't have any enhanced scratch-resistance.

The Xiaomi Redmi 3S achieved a bit lower maximum brightness compared to its Redmi 3 predecessor - 489nits vs. 520 nits. At the lowest level, the screen is not that dim at 13nits, which is a bit disappointing.

The black levels are OK for an LCD panel and, combined with the relatively high brightness, the Redmi 3S achieved a respectable contrast of 1087:1.

Display test	100% brightness
	Black, cd/m2	White, cd/m2	Contrast ratio
Xiaomi Redmi 3S	0.45	489	1087
Xiaomi Redmi 3	0.42	520	1238
Xiaomi Redmi 3 Pro	0.49	561	1145
Samsung Galaxy J3 (2016)	0.00	331	∞
Lenovo Vibe K5	0.53	426	804
Sony Xperia E5	0.43	540	1243
Meizu m3 note	0.52	425	816
Xiaomi Redmi 2	0.58	561	974
Oppo F1s	0.45	420	933

With an average deviation (DeltaE) of 5.5 the screen's color accuracy is about average. The colors are punchy, but if you want a more color accurate representation you may want to try the Warm Color option - it changes the color calibration to a perfectly balanced one with an average DeltaE of 2.9.

Outdoors, the Xiaomi Redmi 3S is an above average performer regarding sunlight legibility. The glass on top of the display is reflective, but most of the time you'll have no problem viewing the screen content.

Sunlight contrast ratio

• Samsung Galaxy S6 edge+
  4.615
• Samsung Galaxy S7 edge
  4.439
• OnePlus 3
  4.424
• Samsung Galaxy S7
  4.376
• HTC One A9
  4.274
• Samsung Galaxy Note7
  4.247
• Samsung Galaxy A3
  4.241
• Samsung Galaxy S6 edge
  4.124
• Samsung Galaxy Note5
  4.09
• Huawei Nexus 6P
  4.019
• Vivo Xplay5 Elite
  3.983
• OnePlus X
  3.983
• Oppo R7s
  3.964
• Apple iPhone 7
  3.964
• Huawei P9 Plus
  3.956
• Samsung Galaxy A7 (2016)
  3.918
• Samsung Galaxy C5
  3.911
• Samsung Galaxy C7
  3.896
• Samsung Galaxy A5
  3.895
• Samsung Galaxy J7 outdoor
  3.879
• Samsung Galaxy J2 outdoor
  3.873
• Samsung Galaxy A8
  3.859
• Samsung Galaxy A9 (2016)
  3.817
• Motorola Moto X (2014)
  3.816
• Samsung Galaxy J7 (2016) outdoor mode
  3.802
• Xiaomi Redmi Pro
  3.798
• LG V20 Max auto
  3.798
• Sony Xperia XZ
  3.795
• Samsung Galaxy A5 (2016)
  3.789
• Apple iPhone 6s
  3.783
• Meizu Pro 5
  3.781
• Microsoft Lumia 650
  3.772
• Samsung Galaxy J7 (2016)
  3.756
• Oppo F1 Plus
  3.709
• Vivo X5Pro
  3.706
• Sony Xperia X Compact
  3.694
• Apple iPhone SE
  3.681
• Samsung Galaxy A7
  3.679
• Meizu PRO 6
  3.659
• BlackBerry Priv
  3.645
• Apple iPhone 6s Plus
  3.53
• Samsung Galaxy J3 (2016) outdoor mode
  3.523
• Samsung Galaxy J3 (2016)
  3.523
• Acer Jade Primo
  3.521
• Microsoft Lumia 950
  3.512
• Oppo R7 Plus
  3.499
• Samsung Galaxy J7
  3.422
• Meizu MX5
  3.416
• LG V20
  3.402
• Oppo R7
  3.32
• Xiaomi Mi 5
  3.24
• Samsung Galaxy J2
  3.235
• Sony Xperia X Performance
  3.234
• Motorola Moto X Play
  3.222
• Huawei P9
  3.195
• Lenovo Vibe Shot
  3.113
• Motorola Moto X Force
  3.105
• LG Nexus 5X
  3.092
• Huawei Mate S
  3.073
• Microsoft Lumia 640 XL
  3.065
• Apple iPhone 6 Plus
  3.023
• Sony Xperia X
  2.989
• Samsung Galaxy Note
  2.97
• Huawei Mate 8
  2.949
• Xiaomi Redmi 3S
  2.913
• Sony Xperia XA Ultra
  2.906
• LG G5
  2.905
• HTC One S
  2.901
• Sony Xperia Z5
  2.876
• Microsoft Lumia 550
  2.851
• Xiaomi Redmi 3 Pro
  2.803
• Sony Xperia Z5 compact
  2.784
• LG V10
  2.744
• Xiaomi Redmi 3
  2.735
• Sony Xperia M5
  2.69
• Huawei P9 Lite
  2.679
• Vivo V3Max
  2.659
• Xiaomi Mi 4i
  2.641
• Sony Xperia XA
  2.609
• Xiaomi Mi 4c
  2.574
• LeEco Le Max 2
  2.567
• Microsoft Lumia 640
  2.563
• Lenovo Moto G4
  2.544
• Oppo F1
  2.528
• Sony Xperia Z5 Premium
  2.525
• Huawei Honor 7 Lite / Honor 5c
  2.506
• Sony Xperia M4 Aqua
  2.503
• Oppo F1s
  2.481
• Motorola Moto G
  2.477
• Lenovo Vibe K5 Plus
  2.473
• Huawei G8
  2.471
• Huawei nova
  2.467
• Sony Xperia Z
  2.462
• Lenovo Vibe K5
  2.459
• Huawei Honor 7
  2.406
• Sony Xperia E5
  2.386
• ZUK Z1 by Lenovo
  2.382
• Samsung Galaxy J5 (2016)
  2.378
• HTC 10
  2.378
• Huawei nova plus
  2.329
• HTC One E9+
  2.305
• Alcatel One Touch Hero
  2.272
• Apple iPhone 4S
  2.269
• Lenovo Vibe K4 Note
  2.254
• Sony Xperia C5 Ultra
  2.253
• Xiaomi Redmi Note 3 (MediaTek)
  2.249
• Sony Xperia C4 Dual
  2.235
• Xiaomi Mi Note
  2.234
• Motorola Moto G (2014)
  2.233
• LG Nexus 5
  2.228
• Huawei P8
  2.196
• Xiaomi Redmi Note 2
  2.166
• OnePlus Two
  2.165
• HTC One X
  2.158
• LG Aka
  2.145
• Archos 50 Diamond
  2.134
• Xiaomi Redmi Note
  2.119
• Xiaomi Mi 4S
  2.095
• Acer Liquid X2
  2.084
• Huawei P8lite
  2.078
• Moto G 3rd gen max manual
  2.026
• Xiaomi Mi Max
  1.996
• Sony Xperia E4g
  1.972
• OnePlus One
  1.961
• Meizu m3 note
  1.923
• BlackBerry Leap
  1.892
• Meizu m2 note
  1.892
• HTC Butterfly
  1.873
• ZTE Nubia Z9 mini
  1.759
• Sony Xperia U
  1.758
• Asus Zenfone Selfie
  1.68
• Motorola Moto E (2nd Gen)
  1.675
• ZTE Nubia Z9
  1.659
• Jolla Jolla
  1.605
• Motorola Moto E
  1.545
• Sony Xperia M
  1.473
• Xiaomi Redmi 2
  1.311
• HTC Desire C
  1.3
• Sony Xperia C
  1.283
• Meizu MX
  1.221
• Sony Xperia E
  1.215

Battery life

The Xiaomi Redmi 3S is powered by a 4,100mAh battery which is a serious power pack for a 5" device. It's also of the same capacity as the original Redmi 3.

We ran our battery test, and the Xiaomi Redmi 3S scored a 104h rating, which means you can count on the battery to last four days and then some if you do an hour each of calling, web browsing and video playback a day.

The endurance rating is about the same achieved by the Redmi 3 and 3 Pro which is about right. If you want to use the phone with two SIM cards, you'll get the same endurance.

The battery testing procedure is described in detail in case you're interested in the nitty-gritties. You can also check out our complete battery test table, where you can see how all of the smartphones we've tested will compare under your own typical use.

Connectivity

The Xiaomi Redmi 3S supports LTE connectivity, and you can tap to an LTE network on either SIM, but once you do, the second one will be limited to GSM connectivity only. As for that, the Redmi 3S also offers tri-band GSM connectivity. There is quad-band 3G connectivity with HSPA support.

The rest of the connectivity features include single-band Wi-Fi b/g/n/ support and Wi-Fi Direct. There is also support for Bluetooth 4.1, GPS with GLONASS and Beidou, plus an FM radio.

A microUSB 2.0 port handles charging and data connections. Media transfer mode is supported for accessing the phone's built-in memory over a USB connection. The microUSB port also supports USB On-the-go for connecting USB peripherals such as pen drives, keyboards or USB hard drives.

Wireless screen mirroring is available via the Miracast protocol.

The IR blaster is located on the top and coupled with the right software, it can be used to operate almost any remotely controlled home appliance, turning the Xiaomi Redmi 3S into a universal remote. Xiaomi provides its MiRemote app right out of the box.