1) Can your phone decode these messages?
Yes, it can. I have an Android.
My thought about the QR codes are that they're convienent & easy to use if you have the right app.
The purpose of QR codes in education is to have students understand the QR codes better & to be more engaged with school related things. The purpose of QR codes for advertising is a way to show a special message to the people that understand QR codes and to engage them to go to their page/website.

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