Allview V2 Viper S was officially announced in October 2016, Device released in October 2016Mobile Network Support and BandAllview V2 Viper S have Dual Micro SIM Card Slots,Allview V2 Viper S support all GSM Based network providers. Allview V2 Viper S 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,Allview V2 Viper S also support LTE based 4G Networks Support at