GSM World Coverage Map and GSM Country List
GSM 900 / GSM 1800 MHz are used in most parts of the world: Europe, Asia, Australia, Middle East, Africa.
GSM 850 / GSM 1900 MHz are used in the United States, Canada, Mexico and most countries of S. America.
GSM World Map - GSM Country List
GSM Bands information by country:

Country / Territory

900 1800 1900 850 Other
Afghanistan
Albania
Algeria
American Samoa
Andorra
Angola
Anguilla
Antarctica :
Mawson and Casey Stations (Australia)
GSM BTS &
Altobridge Gateway Platform
Antarctica :
Marambio Base (Argentina)
AMPS technology &
Entel Chile GSM tower on King George Island
Antigua and Barbuda
Argentina
Armenia Planned 3G 2100
Aruba
Australia 3G 2100, 3G 850, 3G 900
Austria 3G 2100, 3G 850
Azerbaijan
Bahamas
Bahrain 3G 2100, 3G 850
Bangladesh
Barbados
Belarus
Belgium 3G 2100
Belize
Benin
Bermuda
Bhutan
Bolivia
Bosnia and Herzegovina
Botswana
Brazil
British Virgin Islands
Brunei Darussalam 3G 2100
Bulgaria 3G 2100
Burkina Faso
Burma (Myanmar) Planned 900
Burundi
Cambodia 3G 2100
Cameroon
Canada
Cape Verde
Cayman Islands
Central African Republic
Chad
Chile
China
China, Hong Kong (SAR) 3G 2100
China, Macau (SAR)
Colombia
Comoros Planned 900
Congo, Democratic Republic of the
Congo, Republic of the
Cook Islands
Costa Rica
Cote d'Ivoire
Croatia 3G 2100
Cuba
Cyprus 3G 2100
Czech Republic 3G 2100
Denmark 3G 2100
Djibouti
Dominica
Dominican Republic
East Timor (Timor-Leste)
Ecuador
Egypt 3G 2100
El Salvador
Equatorial Guinea
Eritrea
Estonia 3G 2100
Ethiopia
Falkland Islands (Islas Malvinas)
Faroe Islands
Fiji
Finland 3G 2100
France 3G 2100
French Polynesia
French Guiana (French West Indies)
French West Indies
Gabon
Gambia
Gaza Strip / West Bank
Georgia 3G 2100
Germany 3G 2100
Ghana
Gibraltar
Greece 3G 2100
Greenland
Grenada
Guadeloupe (French West Indies)
Guam
Guatemala
Guernsey 3G 2100
Guinea
Guinea-Bissau
Guyana
Haiti
Holy See (Vatican City) 3G 2100
Honduras
Hong Kong 3G 2100
Hungary 3G 2100
Iceland 3G 2100
India
Indonesia 3G 2100
Iran
Iraq
Ireland 3G 2100
Isle of Man 3G 2100
Israel 3G 2100
Italy 3G 2100
Jamaica
Japan* 3G 2100, 3G 1700
Jersey 3G 2100
Jordan
Kazakhstan
Kenya
Kiribati
Korea, North
Korea, South* 3G 2100
Kuwait
Kyrgyzstan
Laos
Latvia 3G 2100
Lebanon
Lesotho
Liberia
Libya
Liechtenstein
Lithuania 3G 2100
Luxemburg 3G 2100
Macau (SAR) 3G 2100
Macedonia
Madagascar
Malawi
Malaysia 3G 2100
Maldives 3G 2100
Mali
Malta
Martinique (French West Indies)
Mauritania
Mauritius 3G 2100
Mayotte
Mexico 3G 850
Micronesia
Moldova
Monaco
Mongolia
Montenegro 3G 2100
Montserrat
Morocco
Mozambique
Myanmar (Burma) Planned 900
Namibia
Nauru
Nepal
Netherlands 3G 2100
Netherlands Antilles
New Caledonia
New Zealand 3G 2100
Nicaragua
Niger
Nigeria
Niue
Norfolk Island
Northern Mariana Islands
Norway 3G 2100
Oman
Pakistan
Palau
Panama
Papua New Guinea
Paraguay
Peru
Philippines 3G 2100
Pitcairn Islands
Poland 3G 2100
Portugal 3G 2100
Puerto Rico
Qatar
Reunion
Romania 3G 2100
Russia 3G 2100
Rwanda
Saint Helena
Saint Kitts and Nevis
Saint Lucia
Saint Pierre and Miquelon
Saint Vincent and the Grenadines
Samoa
San Marino
Sao Tome and Pr'cipe
Saudi Arabia Planned 3G 2100
Senegal
Serbia 3G 2100
Seychelles 3G 2100
Sierra Leone
Singapore 3G 2100
Slovakia 3G 2100
Slovenia 3G 2100
Solomon Islands
Somalia
South Africa 3G 2100
South Georgia and the South Sandwich Islands
Spain 3G 2100
Sri Lanka 3G 2100
Sudan 3G 2100
Suriname
Swaziland
Sweden 3G 2100
Switzerland 3G 2100
Syria
Taiwan 3G 2100
Tajikistan 3G 2100
Tanzania 400
Thailand
Timor-Leste (East Timor)
Togo
Tokelau
Tonga
Trinidad and Tobago
Tunisia
Turkey
Turkmenistan
Turks and Caicos Islands
Tuvalu
Uganda 3G 2100
Ukraine 3G 2100
United Arab Emirates 3G 2100
United Kingdom 3G 2100
U S A 3G 850
Uruguay
Uzbekistan Planned 3G 2100
Vanuatu
Venezuela
Vietnam
Virgin Islands (USA)
Wallis and Futuna
West Bank / Gaza Strip
Western Sahara
Yemen
Zambia
Zimbabwe

Country / Territory

900 1800 1900 850 Other