Mobile Network Support and BandXiaomi Redmi 9 have Dual SIM (Nano-SIM dual stand-by) Card Slots,Xiaomi Redmi 9 support all GSM Based network providers. Xiaomi Redmi 9 mobile device support 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900, - SIM 1 & SIM 2 and Hight Speed 3G Network Band at HSDPA 850,HSDPA 900,HSDPA 1900,HSDPA 2100,HSDPA 1700(AWS),Xiaomi Redmi 9 also support LTE based 4G Networks Support at Frequency level 4G LTE B1/B3/B5/B8/B38/B40/B41, 1, 2, 3, 4, 5, 7,