I also had similar problem. I have rooted Alcatel OneTouch 990 with Android 2.2. I installed avast! Mobile Security, and Anti Theft when it was offered in installation process. I installed Anti Theft as system application and all went just fine. I sent few messages from other phone to test it’s functionality and all went fine until I sent XXXXXX LOCATE message. After that message phone rebooted(as explained in this post: http://forum.avast.com/index.php?topic=89621.0). After trying few times, I sent XXXXXX LOCATE 5 and phone went to boot loop. I tried to send XXXXXX LOCATE STOP and XXXXXX SET PROTECTION 0 message to disable Anti Theft, but phone always rebooted before it received SMS message. I read post from mrm1, but unfortunately I didn’t have Titanium Backup on my phone. Finally, i removed SMS card and SD card from phone and turned it on. This way i could get some extra time before rebooting - actually there was no reboot at all, some applications that are on SD card didn’t start on boot, and I manage to start Anti Theft basic setup and to disable it, and finally uninstalled it. It would be wary nice if you can fix this problem, my opinion is that this application is best protection application you can find around, but with this problem… it is useless for me. If you need list of applications I have on my phone please tell me, I’ll post it here, there could be some conflict.