38 Facts About SIM cards

SIM cards card 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 .

In practise the term "SIM cards card" refers to the entire unit and not simply the IC.

SIM cards 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 cards number is sometimes accompanied by an international article number or a European article number required when registering online for the subscription of a prepaid card.

SIM cards can be used in satellite phones, smart watches, computers, or cameras.

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SIM cards card is a type of smart card, the basis for which is the silicon integrated circuit chip.

Smart SIM cards have since used MOS integrated circuit chips, along with MOS memory technologies such as flash memory and EEPROM .

SIM cards was initially specified by the European Telecommunications Standards Institute in the specification with the number TS 11.

Today, SIM cards are ubiquitous, allowing over 7 billion devices to connect to cellular networks around the world.

SIM cards can come in various data capacities, from to at least.

Each SIM cards is internationally identified by its integrated circuit card identifier .

ICCIDs are stored in the SIM cards and are engraved or printed on the SIM card body during a process called personalisation.

In practice, this means that on GSM SIM cards there are 20-digit and 19-digit ICCIDs in use, depending upon the issuer.

SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity .

Each SIM cards holds a unique Ki assigned to it by the operator during the personalisation process.

SIM cards card is designed to prevent someone from getting the Ki by using the smart-card interface.

SIM cards have been made smaller over the years; functionality is independent of format.

Mini-SIM cards card has the same contact arrangement as the full-size SIM cards card and is normally supplied within a full-size card carrier, attached by a number of linking pieces.

Micro-SIM cards card has the same thickness and contact arrangements, but reduced length and width as shown in the table above.

Micro-SIM cards was introduced by the European Telecommunications Standards Institute along with SCP, 3GPP, 3GPP2, ARIB, GSM Association, GlobalPlatform, Liberty Alliance, and the Open Mobile Alliance for the purpose of fitting into devices too small for a mini-SIM cards card.

The SIM cards was designed to run at the same speed as the prior version.

Micro-SIM cards were introduced by various mobile service providers for the launch of the original iPad, and later for smartphones, from April 2010.

Nano-SIM cards card was introduced on 11 October 2012, when mobile service providers in various countries started to supply it for phones that supported the format.

In July 2013, Karsten Nohl, a security researcher from SRLabs, described vulnerabilities in some SIM cards that supported DES, which, despite its age, is still used by some operators.

In September 2019, Cathal Mc Daid, a security researcher from Adaptive Mobile Security, described how vulnerabilities in some SIM cards that contained the S@T Browser library were being actively exploited.

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The USIM cards brought, among other things, security improvements like mutual authentication and longer encryption keys and an improved address book.

Virtual SIM cards is a mobile phone number provided by a mobile network operator that does not require a SIM cards card to connect phone calls to a user's mobile phone.

An embedded SIM cards is a form of programmable SIM cards that is embedded directly into a device.

The surface mount format provides the same electrical interface as the full size, 2FF and 3FF SIM cards, but is soldered to a circuit board as part of the manufacturing process.

An eSIM cards can be provisioned remotely; end-users can add or remove operators without the need to physically swap a SIM cards from the device.

An integrated SIM cards is a form of SIM cards directly integrated into the modem chip or main processor of the device itself.

However, Japanese CDMA2000-based phones are locked to the R-UIM they are associated with and thus, the SIM cards are not interchangeable with other Japanese CDMA2000 handsets .

SIM cards card introduced a new and significant business opportunity for MVNOs who lease capacity from one of the network operators rather than owning or operating a cellular telecoms network and only provide a SIM cards card to their customers.

SIM cards that are issued by providers with an associated contract are called SIM-only deals.

Commonly sold as a product by mobile telecommunications companies, "SIM cards-only" refers to a type of legally binding contract between a mobile network provider and a customer.

In terms of network usage, SIM cards-only is typically more cost-effective than other contracts because the provider does not charge more to offset the cost of a mobile device over the contract period.

Dual-SIM cards phones are useful to separate one's personal phone number from a business phone number, without having to carry multiple devices.

Thin SIM cards is a very thin device shaped like a SIM cards card, approximately 120 microns thick.