A SIM card, or subscriber identity module, is a small card in your cellphone that connects you to the network. Your SIM card contains your phone number, and lets you make phone calls, send text ...

Every smartphone needs a SIM card that assigns you a phone number and lets you call, text, and use the best data plans. But, there's more than one type of SIM card, and the user experience varies ...

Every month, you pay a bill for cell phone service. Somehow, that access needs to make it to your device. The SIM card, or “subscriber identity module,” connects your phone with your phone bill. While ...