I got Sony M4 Aqua from Carphone Warehouse and after a year it had a hardware failure and was replaced as was still under warranty. No complaints there. 3 days later I had a problem with it not charging and found that squeezing the phone near the USB port allowed it to charge, so obviously a bad connection somewhere. I took it back to my local Carphone Warehouse shop and they sent it off to the Geek Squad for repair. When it came back I was told that the issue was resolved with a firmware update which I queried at the time as it was an obvious hardware fault. "That's what it says on the repair report" I was told. About a month later the screen stopped working so I took it back to the shop again only to have it returned a couple of weeks later telling me that they couldn't repair it as it had been modified, opened or had an unauthorised repair. It turns out that the thermal film, RS cabletop, USB gasget and BTB connector (not sure what they are) were missing from my phone. So it looks like they made a mess of the previous repair and covered it up by saying it was a firmware update so it appeared that they didn't have to open it. Totally disgraceful behavior bordering on criminal. After a week I'm still in the process of disputing this but I'm not really getting anywhere as their customer service would appear to be as bad as their repairs. The shop tells me to contact the repairs team and the repairs team tell me to contact the shop and so on... If you are thinking of getting a phone or having one repaired by them DON'T!! I certainly will never use them again.