Product
Xiaomi Redmi Note 4G
Xiaomi Redmi Note 4G
Vivo Y15
Vivo Y15
Battery
Music play Up to 60 h -
Stand-by Up to 775 h (3G) -
Talk time Up to 38 h (3G) -
Type Li-Po 3100 mAh, removable 5000 mAh, non-removable
Body
Build - Glass front, plastic back, plastic frame
Dimensions 154 x 78.7 x 9.5 mm (6.06 x 3.10 x 0.37 in) 159.4 x 76.8 x 8.9 mm (6.28 x 3.02 x 0.35 in)
SIM Mini-SIM Nano-SIM + Nano-SIM
Weight 185 g (6.53 oz) 190.5 g (6.74 oz)
Comms
Bluetooth 4.0, A2DP, LE 5.0, A2DP, LE
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS, GALILEO, 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, hotspot Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Resolution 720 x 1280 pixels, 16:9 ratio (~267 ppi density) 720 x 1544 pixels, 19.3:9 ratio (~268 ppi density)
Size 5.5 inches, 83.4 cm2 (~68.8% screen-to-body ratio) 6.35 inches, 99.6 cm2 (~81.4% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, proximity, compass
Launch
Announced 2014, August. Released 2014, August 2019, May 28. Released 2019, May
Status Discontinued Discontinued
Main Camera
Features LED flash, HDR LED flash, HDR, panorama
Single 13 MP, f/2.2, 28mm (wide), AF -
Triple - 13 MP, f/2.2, PDAF 8 MP, f/2.2, 16mm (ultrawide) 2 MP, f/2.4, (depth)
Video 1080p@30fps 1080p@30fps
Memory
Card slot microSDXC (dedicated slot) microSDXC (dedicated slot)
Internal 8GB 2GB RAM 64GB 4GB RAM
  eMMC 4.5 eMMC 5.1
Misc
Colors Black/White Aqua Blue, Burgundy Red
SAR - 1.01 W/kg (head)     0.75 W/kg (body)    
Network
2G bands GSM 900 / 1800 - India GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 900 / 2100 - India HSDPA 850 / 900 / 2100
4G bands 3, 40 - India 1, 3, 5, 8, 40, 41
Speed HSPA, LTE Cat4 150/50 Mbps HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Technology GSM / HSPA / LTE GSM / HSPA / LTE
  1, 2, 3, 4, 7 - Malaysia, Singapore -
Platform
Chipset Qualcomm MSM8928 Snapdragon 400 (28 nm) Mediatek MT6762 Helio P22 (12 nm)
CPU Quad-core 1.6 GHz Cortex-A7 Octa-core 2.0 GHz Cortex-A53
GPU Adreno 305 PowerVR GE8320
OS Android 4.2 (Jelly Bean), upgradable to 4.4.2 (KitKat), MIUI 5 Android 9.0 (Pie), Funtouch 9
Selfie camera
Single 5 MP 16 MP, f/2.0, 26mm (wide), 1/3.06", 1.0µm
Video 720p 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes