Thanks Tawi. it WAS working there, but I was under the misapprehension that if I left it on, I could call from Korea (my stop off) if I didnt reactivate roaming. Unfortunately, neither of the phones I have had any signal whatsoever in Korea :(

I don't get any signal whatsoever picked up though. I'd have thought i t would still pick up a network, but not allow calls if that was the case.
Does anyone know if I can reactivate online to see if it makes a difference?