What is a SIM Card?
A SIM card also know as a Subscriber Identity Module is part of a removable Integrated Circuit Card used in mobile phones. A SIM card stores your service-subscriber key (IMSI) which is used to identify you on a particular network. By changing the SIM card in a phone you are effecively changing the phone user.
SIM cards come in 2 sizes but were are only interested in the smaller more popular size: 25mm x 15mm x 0.76mm which you can see in the image below.
The website is a detailed guide explaining all the up to daye places you can get free UK SIM cards from. This means you can get free SIM cards for Vodafone, O2, Orange, Tmobile and Virgin. The main advantage of having multiple SIM cards is that you can take advantage of the different offers each mobile providor has at that moment in time, which can potentially save you hundreds of pounds per year.
Visit the homepage full the current list of free SIM card offers
