What Is A Sim Card
What Is a SIM Card Used For? Some phones need a SIM card to identify the owner and communicate with a mobile network. For example, an iPhone on the Verizon network needs a SIM card so that Verizon knows who the phone belongs to and that they are paying for the subscription, and also so that certain features work. This is important in resale situations, where a used smartphone is missing a SIM card....