What Is a SIM Card? How Your Telephone Connects to the Community


  • A SIM card, or subscriber id module, is a small card in your cellphone that connects you to the community.
  • Your SIM card accommodates your telephone quantity, and allows you to make telephone calls, ship textual content messages, and extra.
  • SIM playing cards have developed through the years and are available a number of sizes, together with mini-, micro-, and nano-SIMs. 

Most cell phones depend on a small card referred to as a SIM (subscriber id module) to make telephone calls and ship textual content messages. With out it, your telephone is not in a position to join with the mobile community and might solely perform as an web gadget (the shortage of a SIM card would not forestall your telephone from utilizing Wi-Fi). 

What to learn about SIM playing cards 

A SIM card is vital as a result of it shops your telephone quantity and different vital info. Typically, you possibly can switch one SIM card between two telephones and the brand new telephone will inherit your telephone quantity with out difficulty.

SD card SIM card being inserted into Android phone

A SIM card identifies you on the wi-fi community.

Pheelings Media/Getty Pictures


Most SIM playing cards are supplied by telephone firms, and include some primary figuring out info like serial numbers and figuring out codes. These let the community know what your telephone quantity is, and what telephone service you employ (T-Cell, Verizon, and so forth.). 

SIM playing cards can carry a substantial amount of knowledge, like your contact record and textual content messages. In case you change telephones, so long as you retain the SIM card, these contacts and textual content messages will include you to the brand new telephone.

Methods to take away a SIM card

SIM playing cards range in measurement, however all of them work the identical manner — they’re designed to be simply transferred between telephones. Your telephone most likely got here with a small SIM card elimination software (it appears to be like like a small pin), however in case you’ve misplaced yours, you should use a small paperclip.

Discover the SIM tray on the aspect of your telephone and insert the SIM software or paperclip within the gap; the tray ought to come out simply. 

What is a SIM card 2

A SIM card in its tray with a SIM elimination software.

Dave Johnson/Insider


For extra particulars on how to do that, see our articles on the way to take away the SIM card from an iPhone or Samsung Galaxy telephone. When you’ve got a special telephone, no worries: The approach is nearly precisely the identical. When you’ve got any bother, take a look at our article on the way to troubleshoot an invalid SIM.



Supply hyperlink