ZTE Nubia Z17s was officially announced in October 2017, Device released in October 2017Mobile Network Support and BandZTE Nubia Z17s have Dual, (Nano Sim) Card Slots,ZTE Nubia Z17s support all GSM Based network providers. ZTE Nubia Z17s 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,ZTE Nubia Z17s also support LTE based 4G Networks Support at Frequency level LTE