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Important information on using your phone internationally
Note for travelers
Even after your phone is unlocked it may not always work worldwide, especially if you are planning a trip to or from the USA and Europe. You may have to check to see if your phone is a "Tri-Band" or a "Dual Band." Bands actually mean a connection frequency between the phone and the network service provider. Your phone needs to be compatible with the frequencies of the country you plan to visit in order for it to work.
Tri-Band Phones
A Tri-Band phone means it has three GSM Bands, which are 850/1800/1900 MHz., or 900/1800/1900. A Tri-band phone manufactured for use in the United States usually has the following three bands: 850/1800/1900 MHz., and a Tri-Band phone manufactured for use in Europe usually has the following three bands: 900/1800/1900. The same phone model may have different bands if it was manufactured for a different country. Tri-Band phones will most likely work worldwide because Tri-Band phones comply with a minimum of one of the bands used in every country.
Dual Band Phones
If your phone does not have one of the bands stated above, then your phone is called a Dual band phone. A USA Dual band phone usually has only the following two bands: 850/1900 (Because these two frequencies are mainly used in the USA). A European Dual band phone usually uses the following bands: 900/1800. (Frequencies that are used in Europe.)
European Dual band phones normally work in all parts of Europe, but you should still try to verify if your particular model complies with the country you are going to.
But the USA dual band phone will never work in Europe, and vice versa.
If you have a "Dual band" phone, you must check before you travel to see if your particular phone can work in the country you will be visiting.
Here is a complete list of GSM Frequency Bands used worldwide (look up by
country).
Here is (going to be) a complete list of all "Tri-band" & "Dual-band" phones.
Go to the home page.
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