Firstly let me start by explaining the difference between a SIM Free phone and the more traditional Contract or Pre-Pay mobile phone. SIM Free refers to GSM phones (see below for more on this) that are sold without a connection or line. SIM Free phones have never been locked to a particular network. It can be said that they are 'unlocked', but actually they have never been locked to begin with! This is better as it means that the phones are in factory condition and are less likely to develop problems.
They can therefore accept any SIM that is associated with a compatible frequency. A tri-band SIM Free phone will work on any GSM network in the world, but you must insert a SIM that works in the area you want to use it. All GSM 900 / GSM 1800 compatible SIM Free phones will work on any UK SIM.
GSM (Global System for Mobile Communications)
The most important aspect of GSM is its standardisation. This allows a SIM card owner to insert the SIM into any SIM Free GSM phone (with compatible frequencies) and the mobile phone would work. This standardisation also applies to anywhere one goes with a GSM network. This is provided that the correct frequency of the card / network is available to that handset.
GSM frequencies are:
* GSM 900 (O2, Vodafone and most networks around the world)
* GSM 1800 (Orange, T-Mobile and some European networks)
* GSM 1900 (Used in USA & Canada)
Phones that are sold tied to a network such as Vodafone, O2, Orange etc. are programmed with all sorts of customisations that can make changing a network far more cumbersome than with a SIM Free phone. With the increasing trend in overseas travel, it is much more cost-effective to buy a SIM card local to the country you are visiting rather that paying the hefty costs that the UK networks charge for overseas calls. SIM Free phones offer the flexibility to do this.
The Future?
SIM Free phones are becoming increasingly popular in the UK and further afield, as the market is now very competitive, offering consumers a wide range of choice at very reasonable prices. Of course a contract is still a very good option, but if you do not want to be tied to a contract, or maybe have a slightly less desirable handset given to you by your employer, SIM Free offers a choice that many consumers haven’t previously considered.
Source:
http://www.articleavenue.com/userinfo-garygrant.html
They can therefore accept any SIM that is associated with a compatible frequency. A tri-band SIM Free phone will work on any GSM network in the world, but you must insert a SIM that works in the area you want to use it. All GSM 900 / GSM 1800 compatible SIM Free phones will work on any UK SIM.
GSM (Global System for Mobile Communications)
The most important aspect of GSM is its standardisation. This allows a SIM card owner to insert the SIM into any SIM Free GSM phone (with compatible frequencies) and the mobile phone would work. This standardisation also applies to anywhere one goes with a GSM network. This is provided that the correct frequency of the card / network is available to that handset.
GSM frequencies are:
* GSM 900 (O2, Vodafone and most networks around the world)
* GSM 1800 (Orange, T-Mobile and some European networks)
* GSM 1900 (Used in USA & Canada)
Phones that are sold tied to a network such as Vodafone, O2, Orange etc. are programmed with all sorts of customisations that can make changing a network far more cumbersome than with a SIM Free phone. With the increasing trend in overseas travel, it is much more cost-effective to buy a SIM card local to the country you are visiting rather that paying the hefty costs that the UK networks charge for overseas calls. SIM Free phones offer the flexibility to do this.
The Future?
SIM Free phones are becoming increasingly popular in the UK and further afield, as the market is now very competitive, offering consumers a wide range of choice at very reasonable prices. Of course a contract is still a very good option, but if you do not want to be tied to a contract, or maybe have a slightly less desirable handset given to you by your employer, SIM Free offers a choice that many consumers haven’t previously considered.
Source:
http://www.articleavenue.com/userinfo-garygrant.html
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