Ok so about a month ago we sold an iPhone 4 16GB to a girl. It was locked to the O2 network and we'd bought it second hand but my mum used it for 18 months with absolutely no issue. Out of the blue the girl who bought it has come back and said she wants her money back because the phone has been blocked and she had contacted the police to confirm this, which they said it had been stolen. Not wanting to be the recipient of stolen property back into our home or be scammed we also contacted the police and they recommended a paid for checking service which would run the details of a phone and flag any blocks or restrictions. It came back completely clean and we sent the report to the girl to confirm this. After asking a little more detail she simply said that she just got no network at all and it had been blocked (she's not the sharpest of tools) and won't really elaborate. Today she has come back and said that she has been to the Apple store and they have said that the phone can only now be used on Wifi. Again however she didn't elaborate or go into detail, she wouldn't even say which Apple store (and the nearest is 50 miles from where she lives). On one hand we feel sorry for her but on the other hand we don't feel like it's our responsibility, also the report states that the phone is legitimately out of contract and has been paid up to date (it's that accurate and the police again confirmed that that's what that part of the report means). So what other reason could it not be working to the point where Apple would say that it can only be used on WiFi? I mentioned that I really would like to know what Apple said, but she has just got to the point now where she just keeps asking for her money back. She's being very persistent for a refund (she bought it from us for £130), as far as I'm concerned buying second hand is a risk you take, a risk we accepted when we bought it. The most worrying thing is that we think that they're a Gypsy family, now please understand that I have no issue with travelling families but round here they are the kind of people who when crossed will set fire to your house first and ask questions later, that is not an exaggeration. So what can I tell her? She's being so scant on the details and refuses to reveal info so I cannot tell if it could be something simple that could be fixed, in which case we wouldn't mind taking it back because we can just get it working and keep it or move it on again.