Not all smartphones require a third-party app to scan QR codes. Kurt "CyberGuy" Knutsson shows you how to scan codes using iPhone or Androids.

Use the built-in camera app on your Android device to scan a quick response (QR) code, or use a code scanner on older models.

Some developers would lead you to believe you need to download their app to scan QR codes. Spoiler: Your phone can do that with built-in features.

In terms of privacy, QR codes can’t actually store data—they just display it. How much information about yourself you’re giving away depends on the app you’re using to scan.