This phone would not recognise my Optus sim card, the seller made suggestions to fix, no good . We saw Optus, they couldn't help. We phoned Oppo and they said the TECHINAL SIDE was NOT an OPPO, It was a FAKE. After much debate with seller, I had to go through ebay to return the phone, which I did. Again after much debate with the Seller, plus Chinese Customs problems and just on 4 weeks I finally got a Full Refund. Please DO NOT buy phones from any Chinese Seller or this Seller meqidlufei Colin