I will be in London and Liverpool in April, and will be travelling with a US-based AT&T iPhone 5. I've seen info on hotspot rental, sim cards and AT&T data plans and am trying to decide what to go with. I will need a mobile hotspot for my computer in addition to data for the phone. My work phone line is VOIP and can run off an app on my iPhone, so one option is to turn off the cellular and use the phone in data-only mode. Any suggestions on how to handle data abroad and the best providers is greatly appreciated.