Problems with Nokia 6630?

Ok my phone is playing up again. All my calls are going straight through to my answerphone and I’m also having problems making calls. Looks like Vodafone are going to have to replace my Nokia 6630 again – this will be the 2nd time.

I’ve heard from a couple of people that this handset is very buggy -anyone else finding this to be true? Should I upgrade to the 6680?