Huawei C199S was officially announced in January 2015, Device released in January 2015Mobile Network Support and BandHuawei C199S have Dual, (Nano SIM + Micro Sim) Card Slots,Huawei C199S support dual mode based on GSM/CDMA based network providers. Huawei C199S mobile device support GSM 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900, Huawei C199S mobile device support CDMA 2G Band Frequency atand there is no 3G Network Band Support,3G for CDMA supports at