All of a sudden today my 1.1.1 (Anysim) unlocked phone's touchscreen became completely unresponsive. I just did a restore to 1.1.1 and the problem persists so it's obviously a hardware failure. Now I have to return it to Apple, but is there anything I need to do to ensure they don't detect is was unlocked? I revirginized the phone prior to the 1.1.1 upgrade.

Any advice is appreciated.