If you don't want to be bothered, just turn off your ringer and notifications. Don't try to invent non-existent social norms. Part of the reason I have a phone is so people can reach me.
That's how new social norms come into the world. Often, they get invented in response to technological change. For example, prior to answering machines being widespread, the norm was to never ignore the phone ringing. After, it became OK to ignore the phone if it was inconvenient to answer because if the call was important, the caller would surely leave a message.
Now there's a push to normalize texting to see if it's a good time before calling, at least if the call isn't urgent. I support this: it's a very minor imposition on the caller's time and reduces interruptions when the callee is busy, as the content of a text can be checked at a glance.
Sure, but now you see why it's easier to text: you might not be able to reach a person at that moment. That's why it takes your daughter and hour to organize things, because the people she's organizing with are busy for the hour.
