Hello everyone! I have recently bought a samsung galaxy s3 and switched from a normal sim to a micro one so that I can use it on my phone. I've been getting an annoying problem ever since I bought the phone. It seems I randomly don't receive text from different persons. The problem fixes itself when I restart the phone(I don't receive the missing messages though) and after a while it repeats. Another problem, not so disturbing as the message one, but possibly related is that again, after a while my live wallpaper disappears and the screen behind the apps turns black. Can anyone give me a hint of what's wrong? Might it originate from the phone or the carrier?