Allview E3 Sign was officially announced in March 2015, Device released in March 2015Mobile Network Support and BandAllview E3 Sign have Dual Micro SIM Card Slots,Allview E3 Sign support all GSM Based network providers. Allview E3 Sign 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 2100,comes with network handling support with Network settings and work offline with flight Mode.