Showing your grandpa how to send a photo for the fourth time is patience he spent on you years ago, coming back around.

Somebody taught you to tie your shoes, repeatedly, without sighing. That debt never gets called in formally, and it does get repaid, usually by the same patience handed back twenty years later. Remembering that the fourth explanation is a return rather than a chore changes how you sound while giving it.

Slow down the next time it is the same question, and show it rather than tell it. Write the steps on a card he can keep by the phone. Let him do it himself while you watch, which is how anybody learns. And answer the fifth time the way you answered the first.