Internet, Wi-Fi and phone
SIM
Abbreviation for Subscriber Identity Module
In short and in plain language
The SIM is a small chip card.
It lets a mobile phone sign in to the mobile network.
It belongs to your contract with the mobile provider and sits inside the phone.
In some phones the chip is built in.
Definition
The SIM is a small chip card that lets a mobile phone sign in to the mobile network. It belongs to the contract with the mobile provider and sits inside the device. With an eSIM the chip is built in.