All of my SMS messages have disappeared, I have had my HTC Desire since the end of May and suddenly today all my SMS messages are gone without warning. I had auto backup to SD card enabled, but this option seems to have disappeared on 2.2, even if I could retrieve the old messages that were backed up to the SD card beforehand that would be great, there's nothing left! Delete old messages is turned off and I have tried turning the phone off and back on again but it hasn't helped. What can I do?