SIM card

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Related to Micro SIM: Mini SIM, Nano SIM

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 ?
Both phones run and the Windows Phone 8 OS, utilise micro SIM cards and exclusively have Beats Audio technology.
The nano SIM card is so tiny that it is one third the size of the standard SIM and almost half the size of the micro SIM.
The new generation of SIM cards approved by the European Telecommunications Standards Institute is 40 per cent smaller than its predecessor, the micro SIM, and measures 12.
This is a smaller SIM card than the current Micro SIM you get in the iPhone 4S as provided by UAE telecoms firms Etisalat and du.
onb cam be t somT slo ex e p on no lik th SIM sw th ex sm lo tis The lack of an SD card slot means you can't expand the 16GB onboard memory and non-contract users will likely bemoan the fact that it uses a micro SIM.
Also from April 1, DOCOMO SIM cards ("FOMA(TM) cards") and micro SIM cards ("docomo mini UIM cards") will become available on a subscription basis for people who wish to use a non-DOCOMO device on the DOCOMO mobile network or a different SIM card in their DOCOMO device.
Micro SIM demands rise on popularity of iPhone 4 and iPad, which have stretched the demand beyond supply.
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It will utilise dual micro SIM cards to access multiple cell networks.
On the left is a big single flap that houses the micro SIM card slots and the microSD card slots.
Removing the back panel reveals two micro SIM slots, a microSD slot accompanied by the 2100mAh battery.
0 ports, a micro SIM for a 3G or 4G network, and a micro USB port for charging, which will spare you lugging around another cord and brick.