Business phone glossary

Our glossary explains basic terms and abbreviations relating to mobile working, the use of smartphones and tablets in the corporate environment (Enterprise Mobility) and security aspects in the use of mobile devices.


SIM card

SIM card

Chip card for user identification in the mobile network

A SIM card (SIM = Subscriber Identification Module) is a physical chip card with which users can identify themselves in the network of a mobile communications provider. The SIM card is inserted into a special card slot on the mobile device and activated.

In many smartphone models, the SIM module is already permanently installed; here, registration can be carried out solely by means of a digital code; the process is then called eSIM (“embedded SIM”).

Devices that are designed to accept and use two SIM cards are called dual-SIM models. SIM cards are available in various sizes. In most cases, they are provided by the mobile network provider as triple SIM cards. Here, all three common sizes (mini-SIM, micro-SIM, nano-SIM) are supplied on a credit-card-sized full-size SIM (the fourth, but now uncommon size).

A nano-SIM card and the corresponding card slots along with the SIM tool.

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