Windows Phone SMS bug
|Here is one of the latest problems with the Windows Phone OS – it turns out that SMS or chat messages from Facebook or Windows Live Messenger can disable the whole message hub directly to the operating system.
This bug is found in Windows Phone 7.5 Mango (versions 7720 and 7740) and most probably is defect in the platform itself, not in the particular device. After receiving a specially formatted message, the entire message section can not be used and you need to hard-reset the phone to fix it.