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A SIM ( Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops ).
Prepaid mobile phone. A prepaid mobile device, also known as a pay-as-you-go ( PAYG ), pay-as-you-talk, pay and go, go-phone, prepay or burner phone, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed ...
Subscriber Identity Module (SIM) A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.
The SIM card is what connects a cellphone to the network, but since it's proprietary of each one, it is a pain to use when traveling and you need to switch from one carrier to another.
Dual SIM. A modern Samsung Galaxy phone with two SIM card slots. It uses nano-SIM instead of the normal sized SIM. Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support ...
A 25 × 15 mm Vodafone New Zealand SIM card. The universal integrated circuit card ( UICC) is the smart card ( integrated circuit card) used in mobile terminals in 2G ( GSM ), 3G ( UMTS ), 4G ( LTE ), and 5G networks. The UICC ensures the integrity and security of all kinds of personal data, and it typically holds a few hundred kilobytes.
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