A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text ...
To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.
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.