My Mum infuriates me with this. When we're with her many times you can't peel the phone out of her hands as she scrolls yet when we text or ring she doesn't see it. Have found it's easier to just text both parents the question, one will answer. Unless it's -I apparently commit the cardinal sin of not having my phone constantly on my person. It gets left on the bed, or in my jacket pocket when I hang it up, or in another room on silent so I don't hear it ring or ping . My son then has to resort to the landline (which we still have for some reason...)
"Do we need to bring anything tonight?"
Dad: "Ask Mum"
Me: throws phone out window