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Conclusion

The truly international standard of GSM has been crucial to it's success worldwide. This has created a large market for mobile equipment and promotes widespread competition amongst manufacturers and cheaper prices for phones and network equipment.

GSM also has all the features above in GSM Features and many more will be added as the networks develop more.

GSM has developed to the point where it will be used in all countries (including Japan and America), to facilitate easy roaming and the ultimate in convient personal communications. Countries like America have networks now based on GSM but instead of in the 900MHz are they operate at 1800MHz and 1900MHz.

Reference: Various Web Sites and M. Mouly (Michel Mouly) and M.B. Pauter (Marie Bernadette Pauter): The GSM system for Mobile Communications:published by them in 1992 and a big thank you to Pierre Dupuy, Eric Tholome and Ron Peereboom.