SIM is short for Subscriber Identity Module. SIM cards are small, removable smart cards used to store data like your mobile phone number, the phone company you use, your billing information and, in some cases, your address book data. They’re a required part of virtually every cell, mobile, and smartphone.

SIM cards can be removed from one phone and inserted into others, so they allow you to easily transport phone numbers stored in your phone’s address book and other data to new phones. Just swap the card to a new phone. (It’s important to note that this applies to SIM cards generally, but not to the iPhone. More on that later.)

SIM cards being swappable also makes them useful in international travel. If your phone is compatible with the cellular networks in the country you visit, you can purchase a new SIM in another country, put it into your phone, and make calls and use data like a local, which is cheaper than using an international data plan.



Not all phones have SIM cards. Other phones have them but READ MORE https://techevangelistseo.com/what-is-an-iphone-sim-card/