Product
Xiaomi Mi 4
Xiaomi Mi 4
Vivo Z3x
Vivo Z3x
Battery
Charging 18W wired, QC2 -
Stand-by Up to 280 h (3G) -
Type Li-Ion 3080 mAh, non-removable Li-Ion 3260 mAh, non-removable
Body
Build Glass front, plastic back, aluminum frame Glass front, plastic back, plastic frame
Dimensions 139.2 x 68.5 x 8.9 mm (5.48 x 2.70 x 0.35 in) 154.8 x 75 x 7.9 mm (6.09 x 2.95 x 0.31 in)
SIM Micro-SIM Nano-SIM + Nano-SIM
Weight 149 g (5.26 oz) 150 g (5.29 oz)
Comms
Bluetooth 4.0, A2DP 5.0, A2DP, LE
Infrared port Yes -
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0, OTG
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot Wi-Fi 802.11 a/b/g/n, Wi-Fi Direct
Display
Resolution 1080 x 1920 pixels, 16:9 ratio (~441 ppi density) 1080 x 2280 pixels, 19:9 ratio (~403 ppi density)
Size 5.0 inches, 68.9 cm2 (~72.3% screen-to-body ratio) 6.26 inches, 97.8 cm2 (~84.2% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, gyro, proximity, compass, barometer Fingerprint (rear-mounted), accelerometer, proximity, compass
Launch
Announced 2014, July. Released 2014, August 2019, April. Released 2019, May
Status Discontinued Discontinued
Main Camera
Dual - 13 MP, f/2.2, PDAF 2 MP, f/2.4, (depth)
Features LED flash, panorama, HDR LED flash, panorama
Single 13 MP, f/1.8, 1/3.1", 1.12µm, AF -
Video 4K@30fps, 1080p@30fps, 720p@120fps, HDR 1080p@30fps
Memory
Card slot No microSDXC (dedicated slot)
Internal 16GB 2GB RAM, 64GB 3GB RAM 64GB 4GB RAM, 64GB 6GB RAM
  eMMC 5.0 eMMC 5.1
Misc
Colors Black, White Black, Red, Aurora
Models 2014215 V1730GA
SAR 0.71 W/kg (head)     0.85 W/kg (body)     -
Network
2G bands GSM 850 / 900 / 1800 / 1900 - all versions GSM 850 / 900 / 1800 / 1900
3G bands TD-SCDMA - 4G model HSDPA 850 / 900 / 2100
4G bands 38, 39, 40 - 4G model 1, 3, 5, 8, 34, 38, 39, 40, 41
EDGE Yes -
GPRS Yes -
Speed HSPA, LTE, EV-DO Rev.A 3.1 Mbps HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Technology GSM / CDMA / HSPA / EVDO / LTE GSM / CDMA / HSPA / LTE
  CDMA2000 1xEV-DO - Telecom 3G model CDMA 800 & TD-SCDMA
Our Tests
Audio quality Noise -91.6dB / Crosstalk -49.7dB -
Battery (old) Endurance rating 68h -
Camera Photo / Video -
Display Contrast ratio: 929 (nominal), 2.424 (sunlight) -
Loudspeaker Voice 62dB / Noise 62dB / Ring 66dB -
Platform
Chipset Qualcomm MSM8974AC Snapdragon 801 (28 nm) Qualcomm SDM660 Snapdragon 660 (14 nm)
CPU Quad-core 2.5 GHz Krait 400 Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)
GPU Adreno 330 Adreno 512
OS Android 4.4.3 (KitKat), upgradable to 6.0.1 (Marshmallow), MIUI 10 Android 9.0 (Pie), Funtouch 9
Selfie camera
Single 8 MP, f/1.8 16 MP, f/2.0, 26mm (wide), 1/3.06", 1.0µm
Video 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes