Mobile Network Support and BandVivo Y31s 5G have Dual Nano-SIM Card Slots,Vivo Y31s 5G support dual mode based on GSM/CDMA based network providers. Vivo Y31s 5G mobile device support GSM 2G Band Frequency at GSM: 850/900/1800/1900, Vivo Y31s 5G mobile device support CDMA 2G Band Frequency atand Hight Speed 3G Network Band at WCDMA bands 1/2/4/5/6/8/19,Vivo Y31s 5G also support LTE based 4G Networks Support at Frequency level 4G LTE B1/B3/B5/B8/B38/B40/B41,comes with