topWhat is GSM?
The Global System for Mobile Communications (GSM) is the worldwide standard for wireless communication. GSM is also the largest wireless platform in the world. With your T-Mobile international phone and SIM card, you can take advantage of this unmatched coverage to make international long distance calls to over 220 countries and make and receive calls in 179 countries and locations through more than 334 providers around the world all with your familiar phone number and features.
The Global System for Mobile Communications (GSM) is the worldwide standard for wireless communication. GSM is also the largest wireless platform in the world. With your T-Mobile international phone and SIM card, you can take advantage of this unmatched coverage to make international long distance calls to over 220 countries and make and receive calls in 179 countries and locations through more than 334 providers around the world—all with your familiar phone number and features.