Mobile Network Support and BandVivo iQOO 3 have Dual Nano-SIM Card Slots, Vivo iQOO 3 support dual mode based on GSM/CDMA based network providers. Vivo iQOO 3 mobile device support GSM 2G Band Frequency at GSM 850,GSM 900,GSM 1800, Vivo iQOO 3 mobile device support CDMA 2G Band Frequency at and Hight Speed 3G Network Band at HSDPA 850,HSDPA 900,HSDPA 1700,HSDPA 1900,HSDPA 2100, Vivo iQOO 3 also support LTE based 4G Networks Support at Frequency level LTE 2100,LTE