From David Smith, a preacher from Texas: 5 reasons to use your bound Bible & not your smartphone in church |.
I have a dumb phone, so this isn’t really a temptation for me, but I like his arguments. I would be tempted to do other stuff with my phone during the service.
I would add, you can’t see much of the text, so it’s hard to make connections between the first verse and the last verse of a passage, where that’s easy to do on a printed page.