Sony Ericsson K770i Network Problem?

Alex

New member
My dad has a K770i and not so long ago it started saying No Network Coverage. I've checked the sim card which is Vodafone on my mobile and the signal strength is full and when I put my sim in his phone there are no bars at all so he cannot ring anyone. I think it may have something to do with his phone please can anyone help with the settings or something?
 
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