What does SIM stand for in SIM card?
"SIM" in SIM card stands for "Subscriber Identity Module".
A SIM card is a tiny chip that stores important information. It's what holds your phone number, carrier details, and network access permissions.
A SIM card (or eSIM) is also the feature that connects your phone to its mobile network, which is what allows you to make calls, send texts, and use mobile data. It is how your provider keeps track of who you are and what services you access.