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The technology and cell phone networks are different in other parts of the world. Unfortunately, cell phones manufactured in the US may or may not work in other GSM networks in other parts of the world.
The U.S. domestic or local cell phones are not compatible in other parts of the world for a number of reasons and some of them are not technology related. It may just come down to inflexible service plans offered by the carriers. First, radio frequencies and encoding services may be different within two companies, even those within the U.S.
Even in the U.S., your phone won't work on the competitor's frequency unless there is a cross billing agreement between the two companies involved. This problem is exacerbated when more than one country is involved
If you want a cell phone which will work in the U.S. and in Europe as well, you should be prepared to purchase a triple band phone-one which will work on 900 Hz, 850 HZ and 1900 HZ. This should play in most areas of the world. It's important to buy the correct triple band cell phone, as some are missing one of the U.S. actors.
In addition to the single and duals band phones, the triple band has now been followed by a quad band.
Once you purchase the right phone for U.S. and satellite services, you also need to signs up to use the internet service; you must connect with one of the service providers who can use the GSM network. Only three providers in the U.S. have GSM service, Cingular, and T-Mobile.
Even if you purchase service one of these two companies and purchase a tri-band phone, some of the companies routinely lock out so you cannot call off another competitor's network. You may find it very difficult to persuade Cingular, for instance to unlock your phone when you need it overseas.
International cell phones are becoming more and more popular as people and businesses continue to travel globally. Millions of new global mobile phones will be sold online as well as through local cellular dealers. People can also purchase international cell phones from local resellers that are often more cost effective than buying a cell at retail. You do have some newer options to buy international phones from new suppliers like ZERO1 Communications, as an example. Costs are often close enough or even lower for international cell phones as for lower power domestic mobile phones.
You can, of course buy overseas, but will face the same compatibility issues in reverse once you return to the U S. You will also find yourself spending an inordinate amount of time arranging for the overseas purchase.
