Ericsson k800i and it is on vodafone.. I cannot make or recieve calls because when I try to make one it makes the ,THIS NUMBER HAS NOT BEEN RECOGNISED, tone. And when someone tries to make a call to me it does exactly the same thing it does it with any other sim card too so its the phone. I can send and recieve text messages ok, could someone please tell me how to sort it out.
it has nothing to do with vodafone

call voda customer service....they'll sort you out