Hi, I am the developer of the YouMail Visual Voicemail application.
A number of our users are using your Bugless Beast release of Android 2.2 (various builds I believe).
For whatever reason their phones are rebooting when they have our app installed (seems to be related to network traffic, although not necessarily ours). When they uninstall, the problem apparently goes away.
The problem doesn't happen on any versions of Android pre 2.2, neither does it seem to be occurring on other 2.2 releases.
I'm happy to assist in find out the cause of this problem - I have message traces (from logcat) leading up to the failure, and restart logs from the phone after the reboot (which show a panic restart).
If both Cellular & WiFi data are disabled the problem doesn't occur, if either (or both) is enabled then the problem does occur.
Some users have indicated that the phone has rebooted when they've been "on the phone" although the majority of reports indicate that the problem occurs when the phone has been allowed to sleep.
Unfortunately the phone only exhibits this problem when not connected via USB, and I don't know how to extract platform logging other than via logcat.