Mobile Network Support and BandVivo Y31 have Dual Nano-SIM Card Slots,Vivo Y31 support all GSM Based network providers. Vivo Y31 mobile device support 2G Band Frequency at GSM: 850/900/1800/1900 and Hight Speed 3G Network Band at WCDMA B1/B5/B8,Vivo Y31 also support LTE based 4G Networks Support at Frequency level 4G LTE B1/B3/B5/B8/B38/B40/B41,comes with network handling support with Network settings and work offline with flight Mode. Device Body Design and