i have a headcanon that after the second wizarding war, muggle technology got sort of integrated into hogwarts after them finding a way to make it not go haywire to allow closer communication with muggle friends and family so they have things like phones and stuff to use to call home.
Imagine if Dudley had a kid who called home after her first day of school
Dursley jr: "Daddy, I made it into Ravenclaw!"
Dudley: "Oh, Ravenclaw, the, um-" *covers receiver and turns to Harry* "What the hell does that mean?"
Harry: "Smart house."
Dudley: *goes back to talking to his child* "THE SMART HOUSE! Oh, I am so proud of you!"
