It would be possible to encode the phone number in the QR code and just send a text, but then you could just print out the phone number and write "text me" next

It would be possible to encode the phone number in the QR code and just send a text, but then you could just print out the phone number and write "text me" next to it. Given that they have an app I'm sure the QR code leads to a link that will trigger the notification via app on the phone, no text message anywhere. Again to your last point, no text message, dude just wants to get a notification on his phone without installing some dumbass $300 doorbell