Some older devices may require a special application to read QR codes, but you can find as many of these applications as you want on Apple App Store and Google Play.
Scanning QR codes using your device couldn't be easier:
Open the QR reader app or camera on your smartphone
Point your phone at the QR code; No matter which angle you point the camera towards the code, you can still access the necessary information.
The data will instantly appear on your screen; for example, if the QR code contains contact information, this information is instantly downloaded to your phone.