Oppo A77T (Qualcomm) was officially announced in July 2017 , Device released in July 2017 Mobile Network Support and BandOppo A77T (Qualcomm) have Dual, (Nano Sim) Card Slots, Oppo A77T (Qualcomm) support all GSM Based network providers. Oppo A77T (Qualcomm) 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 A77T (Qualcomm)