US iPhone Data for International Visitors: A Guide

I’ve just returned from a two-week holiday on the West Coast of the US, and during my trip was asked a number of times how I was using mobile data whilst away. As I gather a number of people are interested, here’s what I was doing during the trip. This method will likely work for most carriers around the world (you just have to get the right SIM card and set up your unlocked iPhone’s data settings correctly): but I’ve tried and tested it on AT&T with a GoPhone account.

Great tips.