Vivo Y81s was officially announced in September 2018, Device released in September 2018Mobile Network Support and BandVivo Y81s have Dual, (Nano Sim) Card Slots,Vivo Y81s support dual mode based on GSM/CDMA based network providers. Vivo Y81s mobile device support GSM 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900, Vivo Y81s mobile device support CDMA 2G Band Frequency atand Hight Speed 3G Network Band at HSDPA 850,HSDPA 900,HSDPA 1900,HSDPA 2100,Vivo Y81s