cell phone work frequencies in the world
Which frequencies are used internationally?
GSM was originally developed in Europe, and only came to the US recently.
Initially, all countries with GSM service used the 900 MHz band. In the past few years, service providers have increasingly been adding 1800 MHz coverage, due to congestion in the 900 MHz band.
When the US started to use GSM, a few other countries with very close links to the US chose to copy the US and use the same frequencies that the US used - first 1900 MHz, and in a few cases, 850 MHz also.
Almost without exception, all international countries that use the non-US international frequency bands have 900 MHz service, and many have some 1800 MHz service as well.
All international countries that have the US frequency bands have 1900 MHz service. A very few might also have some 850 MHz service.
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