Let's discover the smart card contained in your GSM mobile phone (and in every mobile device).

SIM Card

What is a SIM card?

With a microprocessor base, a SIM card is similar to a mini-computer with its operating system, storage, and built-in security features. 

SIM is the acronym for Subscriber Identity
Module.

When configured with up-to-date cryptography, as recommended by NIST, BSI, ANSSI, SIMalliance, etc., SIM cards provide a level of security that is state-of-the-art. 

The SIM card can add, delete, and manipulate information within its memory, on top of sending and receiving data. 

A SIM card can be replaced by users and slides easily into a slot within your phone or mobile device. 

SIM form factors

SIM_Trio_with_format_name.pngDifferent form factors (FF) co-exist: 

  • The credit-card sized SIM is obsolete
  • A regular SIM or 2FF measures 15 millimetres by 25 mm 
  • A smaller version of the SIM called the micro-SIM, or 3FF SIM card (Third Form Factor) is 12mm by 15mm
  • The nano-SIM or 4FF is 8.8 mm by 12.3 mm
  • The eSIM or embedded SIM is not removable and comes either plugged-in or soldered. Its size 6mm by 5mm and thickness is 0,67 mm. 

SIM market size in 2020

Overall, according to Eurosmart, 5.4B secure elements (from SIM cards to eSIMs) have been shipped in 2019. 

2020 growth is expected to be at 0,9% with 5.45B units in volume.

The consolidation of MNOs is impacting an already mature market. 2020 is flat as 5G is not deployed enough to have any significant impact on the SIM market.


According to  Telcoprofessionnals, top SIM card manufacturers include Gemalto, Giesecke & Devrient, Idemia (Morpho and Oberthur Technologies), Bluefish, Datang, DZCARD, to name a few.

What is a SIM card used for?

Designed initially to access mobile phone networks, it authenticates the subscriber and ensures the user is accurately billed for used airtime. 

The SIM also stores your phone directories, messages, information on roaming across different networks, and many other value-added voice and data services. 

End-users can instantly access news, games, chat, and dating services along with mobile payment applications with an easy to use interface. 

The handset model does not restrict it. This feature enables operators to reach all of their customers. 

SIM technology: key for operators

Operator-centred services such as call completion and automatic handset configuration help them reduce their customer billing costs and increase their Average Revenue per User (ARPU).

The SIM is the final link in the chain between networks and end-users, and no customer can connect to the network without their SIM. 

Network operators can communicate, download applications, and manage a SIM card remotely using Over-the-Air (OTA) technology. 

For example, network operators can update the SIM cards with new applications and services without requiring users to upgrade their handsets or visit a store location.

Where do we fit in?

Gemalto is a primary SIM card manufacturer and global solution and service provider.

Gemalto SIM cards provide interoperability and compliance with the latest standards, including new form factors such as the 4FF (Third Form Factor) or the eSIM (embedded SIM). 

This feature ensures that our SIM cards can connect to networks across the globe with any mobile phone or portable device (such as PDAs or Tablet computers). 

Gemalto also provides devices, software, and systems to manage everything from a single user's SIM card to an operator's entire distribution of SIM cards.

More resources

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Definition & benefits of a 5G SIM for 5G virtualized networks

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