Oppo R1S was officially announced in April 2014, Device released in May 2014Mobile Network Support and BandOppo R1S have Yes Card Slots,Oppo R1S support all GSM Based network providers. Oppo R1S 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 1900,HSDPA 2100, TD-SCDMA,Oppo R1S also support LTE based 4G Networks Support at Frequency level LTE 1800,LTE 2600, TD-LTE,comes with