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A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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).
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For GSM, UMTS and LTE networks, this number was provisioned in the SIM card and for cdmaOne and CDMA2000 networks, in the phone directly or in the R-UIM card (the CDMA equivalent of the SIM card). Both cards have been superseded by the UICC. An IMSI is usually presented as a 15-digit number but can be shorter.
The check digit is validated in three steps: Starting from the right, double every other digit (e.g., 7 → 14). Sum the digits (e.g., 14 → 1 + 4). Check if the sum is divisible by 10. Conversely, one can calculate the IMEI by choosing the check digit that would give a sum divisible by 10. For the example IMEI 49015420323751?,
English: A break-apart SIM Card showing the original SIM size (full image), a Mini-SIM size, and a Micro-SIM size card. It is meant as a comparison of GSM Micro-SIM vs. Mini-SIM Cards. The Micro-SIM card is also known as Third Form Factor (3FF).
Free (1 to €1.6 if the subscriber wants to transfer their prepaid credit to the new carrier) The maximum time for the procedure is 24 working hours. In case of delay up to 3 working days no refund is given, if the delay is longer than 3 days user receive a refund of €2.5 for each day of delay, start counting from day 1.
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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 [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.