Mobile phone SIM cards*

From     £1.49 

What is a SIM card?

The SIM (Subscriber Identification Module or Subscriber Identity Module) card - a.k.a. "smart card" - holds all of a subscriber's personal information and phone settings. In essence, it is the subscriber's authorization to use the network. It also holds the phone number, personal security key and other data necessary for the handset to function. The card can be switched from phone to phone, letting the new phone receive all calls to the subscriber's number.
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How do SIM cards work?

The SIM is inside each handset and functions as its digital brain. The authentication and encryption capabilities of the SIM prevent your phone from being stolen and your calls from being eavesdropped on. The SIM's digital memory, which stores information like your rate plan, phone number and service features, also allows you to easily personalize your service and contains user ID and billing information that can be switched between different phones. So, with your SIM card installed, you can make or receive calls personally even when you're using a borrowed phone. Upgrading your phone is as simple as slipping your SIM card into your new phone assuming that phone is not locked to another network.

N.B. The majority of ‘locked’ phones can be unlocked

* Terms and Conditions relating to SIM cards.

Specific Product Information (SIM Cards) - We accept no responsibility if a network provider changes the amount of free credit or specifics, prices, call costs of a call plan or if a SIM card becomes blocked, barred or disconnected from a network. We accept no responsibility for : coverage issues, top-up issues, initial credit issues, credit upon registration issues, SIM card registration issues, or if a network provider ceases to trade. SIM cards are exempt from our ‘Unwanted Goods’ return policy. Minimum top-up requirements and time periods may apply. For the latest call plan information on any SIM card please visit the network providers website. A SIM card may be supplied pre-activated (this process is carried out by our suppliers to avoid disconnection by the network provider whilst in storage). All information on this page was correct at the time of writing.