I have an SIII Mini. Everything is stock, except for the fact that it is rooted.
At times, when somebody calls, the phone won't ring and the caller will immediately hear the answering service message (as though the phone was off). When this happens, there is no way to call anybody as well and the only way to fix it seems to be removing the battery and turning on again. Does anybody know how to fix this? Could flashing the stock ROM again do any good?
Also, the data network connection seems to be embarassingly slow. Does it have anything to do with this?