Motorola

I have had my Razor for about 8 months and have really never had any problems with it. I have changed different things on it, have prog. to access settings that you really shouldnt be able to access, ect. But over all never really had a problem until about 1 week ago. It displays a message on the flip screen saying "my messages are full", and on the outside screen displays "inbox full", but these messages are just not true. Does anyone know what is going on? If so how get this to stop? Any help would be greatly appreciated!!