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The identification details stored on a SIM card are done so as a series of unique numbers. Each number represents a different piece of information, including which country your are in, and which network you are with.
As well as details used to identify the user, a SIM card will usually also store a certain number of mobile phone contacts and text messages. This way, this useful information will not be lost when you transfer to a new phone, as when you switch, you can bring your SIM card with you.
When you swap your SIM card to another mobile, not only does this allow you to operate this new phone, but it also transfers your mobile telephone number to your new handset, as well as your existing phone contacts and saved text messages. This is because all of these details are stored on your unique SIM card.
Many phone users will be aware that their phone is locked. This means that their phone will only work with the SIM card issued to them by their particular network. Mobile telephone handsets bought SIM-free are not locked and can be operated with any SIM, but contract phones are always locked.
This is true especially of subsidised contract phones. Here mobile phone companies offer expensive handsets for free along with a 12 month or 18 month contract, so they want to lock their customer to that particular phone to prevent them from switching.
Phones can be unlocked however, and this is particularly useful to telephone customers travelling abroad. Call and text charges overseas incur an international roaming rate which makes them far more expensive than domestic calls.
But by unlocking your phone, you can buy a SIM card in your destination country which will offer you call and text rates local to that country, which can save you a lot of money.
Article Source: http://www.articlemotron.com
The first SIM card was invented in 1991 by Giesecke and Devrient smart card makers. Its initials mean Subscriber Identity Module, and as the name suggests, the cards are used to store phone subscriber identification details.
Vodafone stock a great range of phones if you are looking to upgrade, or sim cards if you already have your phone of choice.
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