The compatibility of Subscriber Identity Module (SIM) cards between Android and iPhone devices centers on the physical size and technological standards employed. SIM cards store information necessary for a mobile device to connect to a cellular network. Both Android phones and iPhones utilize SIM cards, and in more recent models, eSIM technology, but the operating system of the phone is independent of the SIM card’s function.
The interchangeability of SIM cards offers users flexibility when switching between devices. This feature permits individuals to maintain their phone number and cellular service when upgrading or changing phones. Historically, SIM card sizes have evolved, but the industry has largely standardized on Nano-SIM, minimizing potential physical incompatibility issues. This allows users to more easily transition between devices from different manufacturers.