Keep an old phone handyĭrop your phone in the toilet? No worries! OK, yeah, worries. The SIM card now makes changing devices and phone numbers much easier and opens a world of possibilities. If you needed to transfer your phone number to another device, you usually had to go to your wireless provider’s store and stand around, waiting for help. Back then, the thing that identified your phone on the network was built into the phone itself. Your dad, much to your dismay, wore his clipped to his belt. Way back in the day-I’m talking the ‘90s-we called them cellular phones and they were as big as a gas station burrito. That tiny little chip card that slides into your phone, the subscriber identification module or phone SIM card, makes our mobile lives possible and so much easier.
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