Oppo F1s was officially announced in August 2016, Device released in August 2016Mobile Network Support and BandOppo F1s have Dual, (Nano Sim) Card Slots,Oppo F1s support all GSM Based network providers. Oppo F1s mobile device support 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900 and Hight Speed 3G Network Band at HSDPA 850,HSDPA 900,HSDPA 1900,HSDPA 2100,Oppo F1s also support LTE based 4G Networks Support at Frequency level LTE 2100,LTE 800,LTE 1800,LTE 2600,LTE