Aer John has asked me to get him an iPhone while I am in the US next month. I realise it will have to be unlocked to use this side of the pond and whatever but any advice will be gratefully received
I don't think you can officially buy them unlocked in the US can you?
Edit to add - no sorry, US iphones are locked to AT&T, see this page
I wouldn't personally risk altering my iPhone to unlock it or even jail break it. It's just not worth it.
Regards