Connection problem or invalid MMI code

I am using HTC-Desire with Android 2.2. and got this error: Connection problem or invalid MMI code

And I cant call and accept calls. But my network status seems to be ok. What is the reason and how to fix it ?

i've got the same problem here. me too can't accept calls or make any call.
someone help... plz
i already tried searching on the web but didn't find any solution

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