4. Make sure you have an unlocked GSM phone
For those who don’t know, GSM (Global System for Mobile Communications) is a type of radio system typically used by all mobile carriers except Sprint and Verizon. Phones using GSM technology work internationally, and if your phone's up to date, it probably has that capability—even if it's Verizon. To determine if yours will, look for the term “quad band,” or the specific bands—850, 900, 1800, and 1900 MHz—in the phone’s specifications. A GSM phone that supports all four of these bands will have no trouble sending texts, making calls, or browsing the Internet while abroad. And make sure your phone is unlocked! Here's how to do that.