ZTE Nubia Z7 was officially announced in July 2014, Device released in July 2014Mobile Network Support and BandZTE Nubia Z7 have Dual Card Slots,ZTE Nubia Z7 support all GSM Based network providers. ZTE Nubia Z7 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 Z7 also support LTE based 4G Networks Support at Frequency level LTE 2100,LTE 1800,LTE 2600, Depends