SIM CARD

A SIM card, or Subscriber Identity Module, is a small card that you insert into your phone.

It acts as a key to connect your phone to a mobile network, allowing you to make calls, send messages, and access the internet.

Here's what a SIM card does in simple terms:

Identifies You: The SIM card stores your unique identification information, such as your phone number and network details, so the network knows who you are and what services you're subscribed to.

Authenticates Your Device: It verifies that your device is authorised to use the network, ensuring that only legitimate users can access services.

Stores Data: SIM cards can store some of your contacts and text messages, making it easy to transfer this data to a new phone if needed.

Enables Connectivity: Without a SIM card, your phone cannot connect to a cellular network, except for emergency calls like 999.

SIM cards come in different sizes (standard, micro, nano) and are transferable between devices, allowing you to keep your phone number and some data when switching phones.