However, you definitely should sign up for an international plan before traveling (and even then, calls and data will still be expensive). - iPhones, Android, and some other smartphones from Verizon will work in the U.K., though others will not (only some phones use the world-standard GSM technology-or the newer 4G-LTE-while others are still stuck with a dead-end U.S.Att.com - Since it uses the world-standard GSM, all AT&T phones will work abroad-though you definitely should sign up for an international plan before traveling (and even then, calls and data will still be expensive).
- By far the cheapest option for oversaes travel, with inexpensive ($10–$20) plans that will cover data and/or voice beween dozens of countries at no extra charge.