Tips for Using Your Smartphone Abroad
Before You Go: Sign up for an International Plan
AT&T and Verizon Wireless charge users who don’t have roaming packages significantly more for international calls and data usage, so make sure you enroll. If you’re a Sprint customer with a BlackBerry, the Worldwide plan gives you discounted calls from international destinations (data packages sold separately). T-Mobile doesn’t charge extra for roaming, but you will have to call customer service to turn on the capability.