A dumb phone with good camera, texting, etc seems like a good product idea. Has it been done?
Personally I'd want WhatsApp and Google Maps.
And if you want to deal with QR codes that redirect you to a restaurant menu or ticket ordering portal (I was visiting a country once, it had a long queue for visas on arrival, but it also had a QR code where I could get said visa online), it would need to have a web browser, well there you go, a portal to distraction has been opened.
And then there's a need to have the payment app for the WeChat-esque "Scan QR code to pay" payment system that exists where I live...