Just saw this today, not sure that the rates are anything out of this world but it's an interesting concept. You basically sign up and they send you a SIM card. You can then load your account with data, set limits, etc. and just pop your SIM into your smartphone while you're on the road. https://www.getadoodad.com/ Works in 54 countries (so far) and the "doo-data" expires a year after you buy it, so you don't have to worry about leftover data if you purchase too much and don't travel very frequently.