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Know Your Plan (and Your Phone)
Step one: Examine your phone. Only GSM and CDMA phones will work abroad. Check with your provider to verify that your phone is operable overseas. Step two: Examine your phone plan. A thorough investigation of your data and calling contract will reveal exactly how much it will cost to make a few phone calls or download some emails while abroad. It's expensive, right? That's where step three comes in: Consider buying an international calling or data package. If you plan on using your device overseas and don't want to swap out your SIM card (more on that later), an international plan is likely a wise investment. Simply call your provider and request a temporary plan that works in your destination of choice; in most cases, you can cancel the plan upon return (just make sure there's no minimum-length-of-time requirement).
One provider in particular, however, doesn't necessitate the purchase of an international package. Earlier this month, T-Mobile announced that it will get rid of roaming charges for data usage in more than 100 countries, and it will cap international calling rates at 20 cents per minute.