Micromax Bolt AD3520 was officially announced in January 2015, Device released in January 2015Mobile Network Support and BandMicromax Bolt AD3520 have Dual, (Mini Sim) Card Slots,Micromax Bolt AD3520 support all GSM Based network providers. Micromax Bolt AD3520 mobile device support 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900 and there is no 3G Network Band Support,comes with network handling support with Network settings and work offline with flight Mode.