Definition:
SIM Card – Short for Subscriber Identity Module. SIM cards are small removable smart cards that are used in many cell phones. SIM cards are used to store data like a customer’s mobile phone number and address book contact information.
SIM cards allow users to easily transport their phone numbers and contacts to new phones simply by removing the card from the old phone and inserting it in the new one.
Not all phones have SIM cards and some that have them do not allow users to remove them.
In iPhone
The iPhone has a SIM card, but does not support the addition of existing SIM cards from other mobile phones.
