It’s the size of a credit card and just 1.5mm thick, so it disappears into your wallet, passport pouch, or even an ID badge without adding bulk or drawing attention.

Credit cards have a standard size — 8.56 cm wide by 5.398 cm high — to ensure universal acceptance. Many or all of the products featured here are from our partners who compensate us. This may ...

You could rent a car, stick your credit-card-sized SIM into the car phone, and off you went. You've probably gotten one of these breakout cards before, but the full-sized card is a standard, too.