What Is A Sim Card
But what exactly are these little chips and how do they work? Here’s a short guide. So, when your cell phone connects to a mobile network, the SIM card tells the network who is using it. That way they can track how many minutes you’re using talking to your Aunty Cleo and how much data you’re gobbling up playing Candy Crush. SIM cards can also store small amounts of information, like contacts....