Why SIM card has cut on corner: The cut corner on a SIM card is known as a “key.” Its main purpose is to ensure that the card is inserted into a phone in the correct direction.

SIM Card Design Technology: Have you ever noticed that every SIM card has one corner cut off? This isn't just for aesthetic purposes. There's a technical reason behind it that protects both your phone ...

I bought a SIM-to-microSIM cutter and I tried it on a deactivated SIM card. It was easy enough to do, but it also takes out a small portion of the top of the metallic portion. I put the card in my ...