Motorola V265 / V266 / V276

ok, so i haven't been able to send (and possibly receive) text messages for about 5 days now. and all of a sudden a blinking icon (similar to the new message indicator that looks like an envelope) has appeared now that i've tried to send a message for the first time since, only it has a sort of 'do not enter' sign next to the icon. i've tried with no success to find what this icon means in the manual, online, through friends, etc. i can still make and receive phone calls no problem, but for some reason, i've lost all text messaging abilities. any help would be appreciated.