To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.

A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text ...

It wouldn't take a missile, a cyber army, or even a keystroke from a foreign power to break civilization. It could start with something worth less than a cup of coffee. A one-dollar SIM card.

SIM cards are all around us, and with the continuing growth of the Internet of Things, spawning technologies like NB-IoT, this might as well be very literal soon. But what do we really know about them ...