Oppo R15 was officially announced in March 2018, Device released in April 2018Mobile Network Support and BandOppo R15 have Dual, (Nano Sim) Card Slots,Oppo R15 support all GSM Based network providers. Oppo R15 mobile device support 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900 and Hight Speed 3G Network Band at HSDPA 850,HSDPA 900,HSDPA 1700,HSDPA 1900,HSDPA 2100,Oppo R15 also support LTE based 4G Networks Support at Frequency level LTE 2100,LTE 1800,LTE 2600,LTE