ZTE N919D was officially announced in February 2015, Device released in February 2015Mobile Network Support and BandZTE N919D have Dual Card Slots,ZTE N919D support dual mode based on GSM/CDMA based network providers. ZTE N919D mobile device support GSM 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900, ZTE N919D mobile device support CDMA 2G Band Frequency at CDMA 800and there is no 3G Network Band Support,comes with network handling support with Network