Question

A SIM in a mobile phone stands for:
1. Subscriber Internet Module
2. Subscriber Identity Module
3. Subscriber Internet Model 
4. Subscriber Identity Memory

Answer 1

Correct Answer - Option 2 : Subscriber Identity Module

The Correct Answer is "Subscriber Identity Module".

• SIM is an integrated circuit that securely stores the international mobile subscriber identity (IMSI).
• It is a portable memory chip that makes you able to make phone calls across the world where a subscriber's network is available.
• SIM is generally used in mobile phones that operate on a GSM network. It is portable and you can use it with any supporting mobile phone.
• A SIM also contains its unique serial number (ICCID), International Mobile Subscriber Identity (IMSI), security information, ciphering information, temporary information related to the local network, etc.
• The SIM card contains the necessary information to and fro to your network and it also contains some of your personal data like :
  • Phone number
  • Address book
  • Network authorization data
  • Text messages
  • Personal security keys
  • Other data

 

• When the first SIM card was invented, it was almost the size of a credit card. 
• The newest standard of a SIM contains a size of 15mm by 12mm.
•  Some smartphones use micro and nano SIM cards which are different in size.
• The first SIM card was made by Munich smart-card maker Giesecke and Devrient in 1991.
• The SIM was initially specified by European Telecommunication Standards Institute.