Celkon C4040 was officially announced in January 2014, Device released in January 2014Mobile Network Support and BandCelkon C4040 have Dual Card Slots,Celkon C4040 support all GSM Based network providers. Celkon C4040 mobile device support 2G Band Frequency at GSM 900,GSM 1800 and there is no 3G Network Band Support,comes with network handling support with Network settings and work offline with flight Mode. Device Body Design and Display Celkon C4040