Generally, yes. However, this will depend on how up-to-date your phone is, as well as what type of phone you own. For example, iOS 11 or later comes with a built-in QR code reader, and Android 9 (Pie) or later comes with built-in QR codes as a result of integrating with Google Lens. If your phone does not have a built-in QR code reader, you can download a QR code reading app from your device’s app store.