I have just changed from a 7130 to an 8800, same phone contract with O2. Now I cannot send SMS messages, the option to send does not appear in any menus, but I can receive messages! I don't even get the reply option.
I have the same problem with my Pearl. No menu option to send sms. How did you resolve it? AT&T won't replace the device as I just went past the warranty period. Done all the installation of software, no change.
If you are on BES this could be an Enterprise setting. Check with your admin. Also, try re-sending service books. That fixes almost as many problems as a battery pull.
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I have a Curve 8330 and was able to send email a few days ago. I now cannot email out, but receive just fine. (A few days ago my appointment reminder was not working correctly so I went into preferences and possibly fiddled too much.) Any ideas of where to look?