OK ... the wife's shiny new iPhone does not have any signal ... just says "no service". It did have service for around 1 hour last night and I can be sat in the same room with full signal and I also have a sure signal in the same room so I am convinced it can't be a network problem. The sim works in her old iPhone ... so that leaves me to the conclusion that the phone is faulty.
... before I listen to my own advice and take it to the apple shop is there any tricks or bits of magic I don't know about to kick it into life ?