Due to incompatible standards, most people need to get a different one altogether. Instead, you'll need to rent a cell phone from one of a handful of international cell phone providers. These companies can outfit you with a phone, adapters, and accompanying service for your travels. If you'll be going to a remote location, satellite phones are also available. The fees are much higher, but if you are going into the wilderness, desert, or any other place where frequencies are likely to be scant, you'll need it.
Time is precious.
Just one number. Some U.S.-based wireless providers have begun to offer cell phones that can be used locally as well as abroad. Although the thought of one number is quite attractive, make sure to investigate the offering to make sure the program is right for you. When choosing a service, you will first want to learn whether they offer service in the country or countries you will be visiting. For the most part, you'll find that they do, particularly if you are traveling to Europe or Asia.