Product
Vivo Y71i
Vivo Y71i
Xiaomi Redmi 4 (4X)
Xiaomi Redmi 4 (4X)
Battery
Music play - Up to 87 h
Stand-by - Up to 432 h (3G)
Talk time - Up to 36 h (3G)
Type Li-Ion 3360 mAh, non-removable Li-Po 4100 mAh, non-removable
Body
Build Glass front (Gorilla Glass 3), aluminum back, aluminum frame Glass front (Gorilla Glass), aluminum back, aluminum frame, plastic ends
Dimensions 155.9 x 75.7 x 7.8 mm (6.14 x 2.98 x 0.31 in) 139.2 x 70 x 8.7 mm (5.48 x 2.76 x 0.34 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Micro-SIM
Weight 150 g (5.29 oz) 150 g (5.29 oz)
Comms
Bluetooth 4.2, A2DP, LE 4.2, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, GLONASS GPS, GLONASS, BDS
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection Corning Gorilla Glass 3 Corning Gorilla Glass (unspecified version)
Resolution 720 x 1440 pixels, 18:9 ratio (~268 ppi density) 720 x 1280 pixels, 16:9 ratio (~294 ppi density)
Size 6.0 inches, 92.9 cm2 (~78.7% screen-to-body ratio) 5.0 inches, 68.9 cm2 (~70.7% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, October. Released 2018, October 2017, May. Released 2017, May
Status Discontinued Discontinued
Main Camera
Features LED flash, HDR LED flash, HDR, panorama
Single 8 MP, f/2.2, AF 13 MP, f/2.0, PDAF
Video 1080p@30fps 1080p@30fps
Memory
Card slot microSDXC (dedicated slot) microSDXC (uses shared SIM slot)
Internal 16GB 2GB RAM 16GB 2GB RAM, 16GB 3GB RAM, 32GB 3GB RAM, 64GB 3GB RAM, 64GB 4GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Black, Gold Black, Gold
Models 1801 2016060, 2016090, MAG138, MAE136, Redmi 4, Redmi 4X
SAR - 0.77 W/kg (head)     0.83 W/kg (body)    
Network
2G bands GSM 900 / 1800 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 5, 8, 38, 40, 41 1, 3, 5, 7, 8, 38, 39, 40, 41
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/100 Mbps
Technology GSM / HSPA / LTE GSM / HSPA / LTE
Our Tests
Audio quality - Noise -94.3dB / Crosstalk -94dB
Battery (old) - Endurance rating 80h
Camera - Photo / Video
Display - Contrast ratio: 915 (nominal), 2.920 (sunlight)
Loudspeaker - Voice 64dB / Noise 70dB / Ring 72dB
Performance - GeekBench: 1819 (v4.4) GFXBench: 5.1fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm MSM8917 Snapdragon 425 (28 nm) Qualcomm MSM8940 Snapdragon 435 (28 nm)
CPU Quad-core 1.4 GHz Cortex-A53 Octa-core 1.4 GHz Cortex-A53
GPU Adreno 308 Adreno 505
OS Android 8.1 (Oreo), Funtouch 4 Android 6.0.1 (Marshmallow), upgradable to 7.1.2 (Nougat), MIUI 11
Selfie camera
Single 5 MP, f/2.0 5 MP, f/2.2
Video 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes