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GSM is the most popular standard for mobile phones in the world. If you travel abroad you'll want to make sure you have good mobile phone coverage so choosing the correct GSM phone and GSM SIM is important.
GSM works on 4 bands or frequencies.
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 South America.
When travelling to the respective regions and countries make sure you have a GSM phone and that it operates on the correct GSM band or frequency. Most GSM phones are either Dual band or Tri band. Quad band GSM phones are also available. A regular global traveller would be recommended to use a Quad band GSM phone to ensure that they can use their phone in all countries, regions and on all GSM networks.
GeoSIM is a Global GSM SIM which works in virtually any GSM phone. Using a Quad band GSM phone with a GeoSIM GSM Card ensures you have maximum coverage all over the world on over 550 networks in more than 200 countries.
To use a GeoSIM GSM SIM your handset needs to be unlocked. Many network service providers around the world lock handsets to their own network so only their particular networks GSM cards can be used in the handset. There are numerous methods of unlocking a GSM phone so that any GSM SIM from any network can be used in the handset.