question for UK travelers on cell phone use there: My son is going to London over NewYears for 7 days. He has an iPhone 4S with Sprint. Anyone know what needs to be done for him to use it there? He really only needs to do texts. I had thought to just have him log into WiFi networks there, and use Skype, iMessage, and FaceTime to text us or call us... Thought some of you guys would be able to give me the better answer than wading through Sprint customer support and reading a zillion pages and having them try to sell me an iPhone X every other sentence... Thanks! RK