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simpower

simpower

September 2022 to September 2022

Global sim card card full form Subscriber Identity Module or Subscriber Identification Module is an integrated circuit intended to securely store the international mobile subscriber identity number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices . Technically the actual physical card is known as a universal integrated circuit card (UICC); this smart card is usually made of PVC with embedded contacts and semiconductors, with the SIM as its primary component. In practise the term "SIM card" refers to the entire unit and not simply the IC.

A SIM contains a unique serial number, international mobile subscriber identity number, security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to, and two passwords: a personal identification number for ordinary use, and a personal unblocking key for PIN unlocking. In Europe, the serial SIM number is also sometimes accompanied by an international article number or a European article number required when registering online for the subscription of a prepaid card. It is also possible to store contact information on many SIM cards.

SIMs are always used on GSM phones; for CDMA phones, they are needed only for LTE-capable handsets. SIM cards can also be used in satellite phones, smart watches, computers, or cameras.

The first SIM cards were the size of credit and bank cards; sizes were reduced several times over the years, usually keeping electrical contacts the same, so that a larger card could be cut down to a smaller size.

SIMs are transferable between different mobile devices by removing the card itself. eSIM is replacing Global sim card SIM cards in some domains, including cellular telephony. eSIM uses a software-based SIM embedded into an unremovable eUICC. There are three operating voltages for SIM cards: 5 V, 3 V and 1.8 V (ISO/IEC 7816-3 classes A, B and C, respectively). The operating voltage of the majority of SIM cards launched before 1998 was 5 V. SIM cards produced subsequently are compatible with 3 V and 5 V. Modern cards support 5 V, 3 V and 1.8 V