QR Code RW is a free and easy application for your android phone that lets you read and create QR codes and share them with other people.
You can also decode QR codes from your image gallery, save QR codes in the history list and perform different actions like open a link in the browser, send an SMS, make a phone call, etc.

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Source: https://play.google.com/store/apps/details?id=com.zyxwhite.qrcoderw