An SMS message on your Windows 7.5 handset could knock messaging out cold, a one shot kill you can't prepare for. Apparently, WP 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. The 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. Fixing 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. Before you go abandoning WP7's ship, just know that 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, but in the meantime, all you mobile masochists can see the bug in action after the break.