Xiaomi has excellent devices in middle tier and even higher flagship grade. They lacked presence in 100$ segment, with device which i would like to call complete and excellent choice in segment.
And guess what they succeed! With Xiaomi Redmi 4X. Yes, you will need to give a bit extra money above those magical 100$. But trust me on this it is worth every cent.



Display: 5.0 inch, 1280 x 720 pixels HD screen
CPU: Snapdragon 435 Octa Core 1.4GHz
System: MIUI 8
Camera: 13.0MP rear camera + 5.0MP front camera
RAM+ROM: 2GB 16GB
Battery: 4100mAh
Sensor: Accelerometer, Ambient Light Sensor, Gravity Sensor, Gyroscope, Infrared, Proximity Sensor
SIM Card: dual SIM dual standby, Nano SIM / Micro SIM
Feature: GPS, A-GPS, GLONASS, Beidou
Bluetooth: 4.2, Bluetooth HID
Network:
GSM B2/B3/B5/B8
WCDMA B1/B2/B5/B8
TD-SCDMA B34/B39
CDMA 2000/1X BC0
FDD-LTE B1/B3/B5/B7/B8
TD-LTE B38/B39/B40/B41 ( 2555-2655MHz )