When we bought the farmhouse in 2017 there was — by sheer accident of geography and a hill in the wrong place — no mobile signal in or around the house. There still isn't. We have decent broadband, on purpose, in the office: you can check in with the people who matter once a day, take a video call, look up the train back.
But standing in the kitchen, lying on your mat in the shala, walking the fells — the phone is a nice flat brick. And after the first 36 hours, most people stop noticing it's in their pocket.
We don't make a thing of it. We don't ask you to hand your phone in at the door. We don't lecture. We just have the room set up so the easiest thing is to leave it alone.