I have an international SGS3, unlocked on Vodafone UK. It's 9 months old, has the latest software update as of a couple of months ago plus root - and yesterday, it became a brick. It was asleep, charging, with the red LED on. When I unplugged it, the LED stayed lit and it wouldn't turn on or respond at all. I tried taking out the battery, which of course shut off the charging LED, but it still won't boot. The LED doesn't come on when charging. I can't get any response from it; I've tried removing the Sim card and MicroSD card just in case. I've tried switching it on into recover mode (Home + Vol Down + Power). There's nary a whisper from it. I'd noticed it had been running a bit slow for the last couple of weeks. Nothing drastic and probably not relevant.