What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...

A SIM – traditionally a small plastic card that slots into your mobile phone – is an acronym for ‘subscriber identity module’. It holds information, such as your mobile number, and allows you to make ...

After you purchase and use your cellphone for an extended period of time, you can change networks. However, the phone that you're currently using may not be offered on that network. If you wish to ...

The cut corner on a SIM card serves a crucial practical purpose: ensuring correct orientation and preventing damage to the chip and device. This thoughtful design, originating from early SIM cards, ...

If you’ve bought an iPad with 4G/cellular capabilities (we discuss whether that’s a good idea in our 2015 iPad buying guide) or a new iPhone, you need to buy and install a SIM card. Here, we explain ...

If you have a SIM card that you want to put in another phone that you have, but it doesn’t fit in the SIM card tray, here’s how to resize a SIM card so that it does fit. There are three sizes of SIM ...