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Firstly permit me to start by explaining the difference between a SIM Free telephone and the more conventional Contract or Pre-Pay cellphone. SIM Free alludes to GSM telephones ( see later on for more on this ) that are sold without a connection or line. SIM Free telephones haven't ever been locked to a selected network.It may be said that they're 'unlocked', but essentially they haven't ever been locked to start with! This is better as it suggests the telephones are in factory condition and are less certain to develop issues. They can consequently accept any SIM that's connected with a compatible frequency. A tri-band SIM Free telephone will work on any GSM network in the world, but you should insert a SIM that works in the area you would like to use it. All GSM 900 / GSM 1800 compatible SIM Free telephones will work on any UK SIM.

GSM ( Worldwide System for Mobile Communications ) the most significant facet of GSM is its standardisation. This permits a SIM card owner to insert the SIM into any SIM Free GSM telephone ( with compatible frequencies ) and the telephone would work. This tandardisation also is applicable to anywhere one goes with a GSM network. This is provided the correct frequency of the card / network is available to that handset.

GSM frequencies are : -
- GSM 9 hundred ( O2, Vodafone and most networks around the globe )
- GSM 1800 ( Orange, T-Mobile and some European networks )
- GSM 1900 ( Used in USA & Canada )

Telephones that are sold tied to a network like Vodafone, O2, Orange for example. Are programmed with all kinds of customisations that may make changing a network much more unwieldy than with a SIM Free telephone.With the accelerating trend in foreign travel, it is way more inexpensive to get a SIM card local to the country you are visiting rather that paying the sizeable costs the UK networks charge for overseas calls. SIM Free telephones offer the ability to do this.

The Future?
SIM Free telephones are continuing to become popular in Great Britain and further out, as the market is now awfully competitive, offering buyers a large range of choice at fair costs. Naturally a contract is still an excellent option, but if you don't need to be tied to a contract, or perhaps have a touch less fascinating handset given to you by your employer, SIM Free offers a decision that many clients haven't formerly considered.