A SIM card or SIM (subscriber identity module) is a type of integrated circuit, often in the form of a smart card.

Jan 24, 2026 · What is a SIM card? SIM stands for “ Subscriber Identity Module,” and a SIM card is essentially the card that holds your carrier’s subscriber identity data.

Jun 4, 2025 · What is a SIM card and how does it work? A SIM card, also known as a subscriber identity module, is a smart card that stores the information necessary for a smartphone to connect to a …

Dec 4, 2025 · What Is a SIM Card and How Does It Work? SIM cards house essential information for your mobile device to operate. Think of a SIM card as the heart of your mobile device: without it, you …

Dec 4, 2025 · Because of SIM card technology, you are able to keep your phone number from device to device, or even carrier to carrier, while easily transferring hundreds of text messages and other data …

If you’re wondering, “what does SIM stand for?” it’s an acronym for Subscriber Identity Module, which securely stores your unique subscriber information. This includes your mobile number, network …

SIM Cards & eSIMs Learn about the differences between SIM cards & eSIMs. What is a SIM Card? A SIM card is a tiny chip with all the info your device needs to hook up to Boost Mobile. Just pop it into …