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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).
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]
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 Both cards have been superseded by the UICC.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 phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
The latest software iOS 17, which was revealed at Apple's WWDC 2023 event, is compatible with the iPhone 13 and 13 Mini. [19] The next-generation Qi2 wireless charging standard has been added to the iPhone 13 and iPhone 13 Mini with the update to iOS 17.2. [20] It is compatible with iOS 18, which was released on September 16, 2024. [21]
It is common for each SIM card has a separate phone number, so phones with multiple SIM cards will have multiple phone numbers. As another caveat, some mobile phone numbers may be used by machines as a modem , such as intrusion detection systems, home automation, or leak detection, and some numbers may be used as a local micro-cell.
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