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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).
A T-mobile SIM card using Moreno's smart chip.. After leaving Chimie-Actualités, Moreno founded his own company, Innovatron, to market ideas and intellectual property. [1] He successfully marketed a software system which merged dictionary words to create new product or brand names for companies.
Consequently, some computer manufacturers started to embed the mobile data function directly into the laptop so a dongle or MiFi was not needed. Instead, the SIM card could be inserted directly into the device itself to access the mobile data services. Such 3G-capable laptops became commonly known as "netbooks".
The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient for the Finnish wireless network operator Radiolinja. [citation needed] A hybrid mobile phone can hold up to four SIM cards, with a phone having a different device identifier for each SIM Card. SIM and R-UIM cards may be mixed together to allow both GSM and CDMA ...
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.
An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning; end-users can change mobile network operators without the need to physically swap a SIM from the device.
The Apple SIM is known as a Removable SIM with Remote Provisioning [5] – it is a special SIM card that may be configured with different operator profiles. This is in contrast to an embedded SIM, which is not removable and may also be remotely provisioned. It appears that Apple has begun to include both types of SIM in their newer devices. [6]
1G refers to the first generation of mobile telecommunications standards, introduced in the 1980s. This generation was characterized by the use of analog audio transmissions, a major distinction from the subsequent 2G networks, which were fully digital.