SIM card

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SIM card

(Subscriber Identity Module card) A smart card that gives a cellphone its phone number and customer identity. Introduced in 1991 for GSM phones, most cards are removable. Satellite and LTE phones also use SIM cards. Activated by the cellular carrier, the SIM card contains a unique ID, authentication codes, network-specific data and the customer's phone contacts. See IMSI.

As long as users stay with the same carrier, they can generally switch their phone number and calling plan to a different phone by moving the SIM card. For travelers, prepaid SIM cards are available for unlocked phones, and phones that hold more than one SIM are also offered (see multi-SIM). In the early 1990s when cellphones were large, the first SIMs were the size of a credit card (1FF). See eSIM, SIM lock, R-UIM and smart card.

Mostly Nothing
A SIM is just a chip behind contacts. The rest is cardboard. Used for a while were Micro SIMs in a Mini SIM form factor (right).

Size   Thick   Form SIM Card         (mm)    (mm)   Factor

  Full Size        86x54   .76    1FF
  Mini (Standard)  25x15   .76    2FF
  Micro            15x12   .76    3FF
  Nano             12x9    .67    4FF
  Embedded   6x9  up to 1

Mini SIM
This Mini SIM was removed and flipped over to show the contacts and the six pins they press against.

Open the Case or Slide Out the Tray
Access to a SIM card is either from the inside by taking the back off or by inserting a pin into the side of the phone that releases the tray.

Prepaid SIM Cards
For travelers with unlocked Android and other GSM cellphones, prepaid SIM cards can be purchased.

Mini or Micro
A SIM card may come in both Mini and Micro SIM formats that can be punched out as required.
References in periodicals archive ?
The House Committee on Information and Communications Technology has recently endorsed for plenary approval a bill mandating the registration of SIM cards.
Once this bill passes into law, SIM card users wont have to submit personal information and proof of identification to their mobile operators just to access mobile money services.
I called the etisalat toll-free number and informed them that the Sim card was free.
The regulation only permits selling SIM cards through the operators' outlets and their resellers who obtain a formal approval from the TRA to conduct the registration and verification processes on behalf of the mobile operators.
This is considered a temporary procedure to correct and remedy the large number of illegal SIM cards in the market," the Communications and Information Technology Commission, Saudi Arabia's telecommunications regulator, said in a statement to Bloomberg.
Not only in Punjab and Jammu and Kashmir but the ISI spies had also used Indian SIM cards to call people in Laddakh.
The case also protects your handset and also servers as a holder for additional SIM cards and a SIM tray popout pin.
Supporters say that mandatory SIM card registration would deter and identify those behind scams, crimes, and terrorism.
BEIRUT: Witness testimonies during a hearing for the Special Tribunal for Lebanon Wednesday laid out in detail how the assassins of former Prime Minister Rafik Hariri forged documents to obtain SIM cards they would later use to stage the attack.
A buyer who cannot produce valid identification with photo and who fails to accomplish a registration form shall be refused sale of a SIM card by the direct seller.
The Sudanese Telecommunication Corporation (STC) has withdrawn service from hundreds of thousands of subscribers, who failed, after months of warning, to register their SIM cards, known as Subscriber Identity Module (SIM).
He said a meeting of the companies would be held with the Interior Ministry on Wednesday wherein it would be decided how to further make the SIM card registration mechanism foolproof.