My inbox on my razor phone says no messages but memory full

I mentioned this in another area. We just got my son a motorola razr v3m, verizon. Any time he tried to check his inbox (which is text) or tried to send a text it would show memory full....this was the same if he tried to take a picture and send it.

First take out your battery, with the battery out, hold down you on button for like 15 seconds to drain the phone of juice, then put your battery back in it and turn it on. If this did not reset your phone, and if you are on verizon as your carrier, then you need to call them and make sure that they have you set up on their text messaging program. It used to be that if you didn't have, then they would charge you .20 cents a text, but with some of the razr, such as the v3m, you have to actually be on a monthly text plan to view inbox, send text, send pics, and receive pics and texts.