Icoverlover Blog SIM, eSIM, iSIM: How Do They Differ?

To use your smartphone (and some smartwatches/wristbands), you'll need one type of SIM card. The Subscriber Identification Module (SIM) assigns you a phone number and connects your phone to a mobile network or carrier. Without a SIM card, you cannot make calls, send SMS/MMS messages or use the data network. Using SIM technology, it is easier to make calls, send and receive messages, and connect ...