I currently have a Thunderbolt and am using Handcent for SMS/MMS. The messages managed to delete themselves tonight. I simply opened Handcent and all gone. Not one, but ALL SMS and MMS. I had an Droid (1) and had the same problem happen twice. I also have a Droid X and have not experienced the problem. My understanding is that the messages are being read from the messaging service of the operating system and are not stored in Handcent, the app does have the ability to delete the messages. So, I am not sure if the problem is related to Handcent, an OS bug, or a setting that I can change. ,Does anyone know of a cause or resolution for this problem?