I bought the Samsung galaxy s6 in the January sale using o2 refresh after seeing the deal advertised on here. As suggested I cancelled the airtime contract and unlocked the phone. I currently use an EE sim only deal. The phone has now developed a fault in that it doesn't charge using the charging slot on the bottom of the phone, I have to charge it wirelessly. My question is do I need to take it back to o2 (even though I am no longer on o2, or do I need to contact Samsung directly? Also if I return the phone, will it come back unlocked, or will it be locked to o2 again?