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What make and model phone are you using?
Are you using the Stock messaging app? Or have you downloaded another one like Handcent, etc.?
Ok no problem, follow these steps and it should resolve your issue .
I made a video you can watch here( http://www.youtube.com/watch?v=IOaFbSMCGYE ) or you can use the written steps below:
If that doesn't resolve it, there could be a more serious issue. Download a free messager (sms/mms) app called "GO SMS Pro". During the setup just click OK, or Next, and keep the default settings. Use this app and see if you can send and receive texts. If you cant after trying both things, then please tell me as its a more serious issue.
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