you can check yourself about supported bands on mi site:
http://www.mi.com/in/redmi4a/specs/
Networks and Connectivity
Network bands
4G FDD-LTE B3,B5
TD LTE B40
3G WCDMA B1,B8
2G GSM B2, B3,B5,B8
Connectivity
Bluetooth 4.1, Bluetooth HID
801.11 b/g/n, 2.4GHz Wi-Fi
Wi-Fi Direct
Dual SIM use...