The sim card or Subscriber Identification Module remains the most common device used in mobile handsets. It is what renders a majority of cases the mobile handset operable. The best sim only deal is basically a matter for the consumer to choose from the options available at his disposal. These cards come in three variants with the first the size of a credit card. One of the edges is bent to prevent wrong use. The beauty of the sim card lies in its simplicity which permits varied use with a simple functional basis. Wrong application of sim cards makes the mobile handset non functional.

In sim only deals the consumer has to accept the service of a network provider for a given length of time. Premature withdrawal results in a penalty. The idea is to retain customers to the maximum extent possible and promote brand loyalty in the mobile handsets sector. In pay g services however the customer has the option of premature withdrawal from one network provider to another. This is because there is no hassle of monthly bills and fixed sim only contract.

Apart from their role of enabling basic connectivity sim cards today enable storing messages and numbers. There has been a substantial capacity addition in this regard. The earliest models could only store 5 messages and 20 contacts while the latest models can now store up to 200 contacts. In a way this also reflects the increasing complexity of mobile handset technology that has been constantly evolving and not remained static.

The SIM only deals being offered in the UK come under certain distinct variants which are International SIM ,SIM with Unlimited Data, iphone SIM, Contract SIM and Ipad SIM. The leading network providers are actively involved in providing these deals. For instance Vodafone, O2 and Orange are the main network providers offering iphone sim deals. These come at different rentals and with differing proportions of free texts and talk time.

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