26-07-2012 09:26 - edited 26-07-2012 09:27
First thing to try: Pull your battery. With most BB problems this has a 99% succes rate
If this does not solve the problem, can you give us a little more information?
Which BB do you have, were you able to send messages before, did you check to see if you have coverage, did you change any settings, did you try to message several people?