An SMS message on your nice new Windows 7 powered device could knock out your messaging out in a cold, a one shot kill and you can’t prepare for it.
Apparently, Windows Phone 7 devices that receive a text containing a certain string of characters will reboot and return with a non-functional messaging client which can only be restored via a hard reset. This flaw is not device-specific and has been found to affect other parts of the OS. Locking up your handset if you’ve pinned a friend as a live tile and that buddy posts the magic bug words on Facebook or Windows Live Messenger.
To fix the problem requires quick tapping fingers, as you’ve got to remove the pinned tile after rebooting before it flips and freezes the phone again.
BUT before you go abandoning WP7’s ship, just know that these sms issues are a known phenomenon and have affected all the major mobile players, iOS and Android included. Until Microsoft releases a fix, cross your fingers and hang tight.
The Path Untaken 