Scanning a QR code with your phone is a common request, and should be simple, right? But it's not always as obvious how to do it as it should be.

TECH How to scan a QR code with your iPhone or Android phone (no apps needed) QR codes are those pixelated squares you see in restaurants, advertisements, stores, food packaging, business cards ...

QR codes are so popular that nearly every device with a camera lets you scan them. Here's how to do it with your phone, tablet, or computer.

The FBI wants people to check the websites that QR codes direct them to carefully. The bureau also advises people to use their phones' app stores, rather than QR codes, to download any mobile apps.