ZTE Grand X Max+ was officially announced in January 2015, Device released in January 2015Mobile Network Support and BandZTE Grand X Max+ have Yes Card Slots,ZTE Grand X Max+ support all GSM Based network providers. ZTE Grand X Max+ mobile device support 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900 and Hight Speed 3G Network Band at HSDPA 900,HSDPA 1900,ZTE Grand X Max+ also support LTE based 4G Networks Support at Frequency level LTE 700,LTE 850,LTE 1700,LTE