General:
GSM-900 and GSM-1800
GSM-900 and GSM-1800 are used in most parts of the world: Europe, Brazil (GSM-850 and 1800), Middle East, Africa and most of Asia.
GSM-850
GSM-850 and GSM-1900 are used in the United States, Canada, and many other countries in the Americas. GSM-850 is also sometimes called GSM-800 because this frequency range was known as the "800MHz Band" when it was first allocated for AMPS usage in the United States in 1983.
GSM-1900
GSM-850 and GSM-1900 are used in the United States, Canada, and many other countries in the Americas.
GSM-450
Another less common GSM version is GSM-450[1]. It uses the same frequency as and can co-exist with old analog NMT systems. NMT is a first generation (1G) mobile phone system which was primarily used in Nordic countries, Eastern Europe and Russia prior to the introduction of GSM.
Detail List:
GSM-1900：
* Antigua
* Argentina
* Bahamas
* Barbados
* Belize
* Bermuda
* British Virgin Islands
* Bolivia
* Canada
* Chile
* Colombia
* Dominican Republic
* El Salvador
* Honduras
* Guatemala
* Jamaica
* Mexico
* Nicaragua
* Paraguay
* Peru
* Puerto Rico
* Trinidad and Tobago
* United States
* Uruguay
* U.S. Virgin Islands
GSM-850：
* Anguilla
* Antigua
* Argentina
* Bolivia
* Brazil
* Canada
* Colombia
* Dominican Republic
* Ecuador
* El Salvador
* Grenada
* Guatemala
* Haiti
* Honduras
* Montserrat
* Nicaragua
* Panama
* Paraguay
* Peru
* Trinidad & Tobago
* United States
* Uruguay
* Turks and Caicos Islands
* Venezuela
GSM-900：
* Antigua
* Barbados
* Brazil
* British Virgin Islands
* Cuba
* El Salvador
* Falkland Islands
* French Guiana
* Grenada
* Guatemala
* Jamaica
* St. Pierre and Miquelon Islands
* Suriname
* Venezuela
GSM-1800：
* Barbados
* Brazil
* Dominican Republic
* Costa Rica
* Grenada
* Jamaica
* Trinidad & Tobago
* Uruguay