Oppo R15x vs Oppo R9 vs Oppo R7 comparison

Compare Oppo R15x
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key specs
Display6.40-inch5.50-inch5.00-inch-
Processorocta-core2GHz octa-core1.5GHz octa-core-
Front Camera25-megapixel16-megapixel8-megapixel-
RAM6GB4GB3GB-
OSAndroid OreoAndroid 5.1Android 4.4-
Storage128GB64GB16GB-
Rear Camera16-megapixel + 2-megapixel13-megapixel13-megapixel-
Battery Capacity3500mAh2850mAh2320mAh-
Resolution-1080x1920 pixels1080x1920 pixels-
general
Release dateNovember 2018March 2016--
Battery capacity (mAh)350028502320-
ColoursNebula, Ice Blue-Silver, Gold-
Form factor-TouchscreenTouchscreen-
Dimensions (mm)-151.80 x 74.30 x 6.60143.00 x 71.00 x 6.30-
Weight (g)-145.00147.00-
Removable battery-NoNo-
display
Screen size (inches)6.405.505.00-
TouchscreenYesYesYes-
Resolution-1080x1920 pixels1080x1920 pixels-
Pixels per inch (PPI)-401441-
hardware
Processorocta-core2GHz octa-core1.5GHz octa-core-
Processor makeQualcomm Snapdragon 660MediaTek MT6755Qualcomm Snapdragon 615-
RAM6GB4GB3GB-
Internal storage128GB64GB16GB-
Expandable storage-YesYes-
Expandable storage type-microSDmicroSD-
Expandable storage up to (GB)-128128-
camera
Rear camera16-megapixel + 2-megapixel13-megapixel13-megapixel-
Front camera25-megapixel16-megapixel8-megapixel-
Rear flash-LEDDual LED-
software
Operating systemAndroid OreoAndroid 5.1Android 4.4-
SkinColorOS 5.2ColorOS 3.0ColorOS 2.1-
connectivity
Wi-FiYesYesYes-
GPSYesYesYes-
BluetoothYesYesYes, v 4.10-
Headphones3.5mm3.5mm3.5mm-
NFC-NoNo-
Infrared-NoNo-
USB OTG-YesYes-
FM-NoYes-
Number of SIMs-22-
Wi-Fi standards supported--802.11 b/g/n-
sim 1
SIM Type-Micro-SIMMicro-SIM-
GSM/CDMA-GSMGSM-
3G-YesYes-
4G/ LTE-YesYes-
sim 2
SIM Type-Micro-SIMNano-SIM-
GSM/CDMA-GSMGSM-
3G-YesYes-
4G/ LTE-YesNo-
sensors
Compass/ Magnetometer-NoNo-
Proximity sensor-YesYes-
Accelerometer-YesYes-
Ambient light sensor-YesYes-
Gyroscope-YesYes-
Barometer-NoNo-
Temperature sensor-NoNo-