Product
Xiaomi Redmi Go
Xiaomi Redmi Go
Samsung Z4
Samsung Z4
Battery
Type Li-Ion 3000 mAh, non-removable Li-Ion 2050 mAh, removable
Body
Build Glass front, plastic back, plastic frame -
Dimensions 140.4 x 70.1 x 8.4 mm (5.53 x 2.76 x 0.33 in) 132.9 x 69.2 x 10.3 mm (5.23 x 2.72 x 0.41 in)
SIM Nano-SIM + Nano-SIM Single SIM (Micro-SIM) or Hybrid Dual SIM (Micro-SIM, dual stand-by)
Weight 137 g (4.83 oz) 143 g (5.04 oz)
Comms
Bluetooth 4.1, A2DP, LE 4.0, A2DP, LE
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0, OTG
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Resolution 720 x 1280 pixels, 16:9 ratio (~296 ppi density) 480 x 800 pixels, 5:3 ratio (~207 ppi density)
Size 5.0 inches, 68.0 cm2 (~69.1% screen-to-body ratio) 4.5 inches, 57.6 cm2 (~62.7% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, proximity Accelerometer, proximity
Launch
Announced 2019, January. Released 2019, February 2017, May. Released 2017, June
Status Discontinued Discontinued
Main Camera
Features LED flash, HDR Dual-LED flash, panorama, HDR
Single 8 MP, f/2.0, 1/4.0", 1.12µm, AF 5 MP, f/2.2
Video 1080p@30fps 720p@30fps
Memory
Card slot microSDXC (dedicated slot) microSDXC (uses shared SIM slot)
Internal 8GB 1GB RAM, 16GB 1GB RAM 8GB 1GB RAM
  eMMC 5.1 -
Misc
Colors Black, Blue Black, Gold
Models M1903C3GG, M1903C3GH, M1903C3GI SM-Z400F, SM-Z400Y
SAR 0.58 W/kg (head)     1.50 W/kg (body)     -
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only)
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 900 / 2100
4G bands 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40, 41 LTE
Speed HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
Technology GSM / HSPA / LTE GSM / HSPA / LTE
Platform
Chipset Qualcomm MSM8917 Snapdragon 425 (28 nm) -
CPU Quad-core 1.4 GHz Cortex-A53 Quad-core 1.5 GHz
GPU Adreno 308 -
OS Android 8.1 Oreo (Go edition) Tizen 3.0
Selfie camera
Features HDR LED flash
Single 5 MP, f/2.2, 1/5.0", 1.12µm 5 MP, f/2.2
Video
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes