Text Messages ort Calls will not open
I would definitely reset the phone, unless you can find a way to clear the text messages out before it crashes to the Main Menu. My guess is that you have a corrupted text message in your inbox, and it is crashing the software.
Resetting the phone will wipe out all of the data on it, so make sure you back it up first. If you have the Motorola Phone Tools, you may also want to try accessing the text messages or updating the phone software through it first.