Network Busy

I'm geting a network busy error on my N80, If tried another phone with a different sim on the same network and it seems to work fine. Why is my phone giving me a network busy error? is it the sim card?

UPDATE: same sim card different phone works fine.
 
I have a couple of 6682's with Cingular that get "Network Busy" also, but only after restarting the phone. I tried my sim in an old 6600, and didn't duplicate the busy. Putting it back in my 6682 made it busy again. When it happens to you, try calling your cell from a landline. In my case, once my cell receives a call, it works fine afterwards.
 
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