I have a very similar experience as you, almost all of my friends do not use their cellphones apart from a minimal amount in case a message needs a time sensitive reply.
I do have a couple of them who have an extreme habit of zoning out into their phones, sometimes in the middle of a conversation, we are close enough where I have set a boundary/game when we meet, they give me their phones and we put them face down somewhere, they can check it after stating out loud the reason for using it, it's helped them immensely to unglue from their phones during social hangouts since they noticed they were simply addicted.
There's very little that tires and bores me the fuck out more in a social hangout than people on their phones, it just feels so rude, and hollows the experience.
I do have a couple of them who have an extreme habit of zoning out into their phones, sometimes in the middle of a conversation, we are close enough where I have set a boundary/game when we meet, they give me their phones and we put them face down somewhere, they can check it after stating out loud the reason for using it, it's helped them immensely to unglue from their phones during social hangouts since they noticed they were simply addicted.
There's very little that tires and bores me the fuck out more in a social hangout than people on their phones, it just feels so rude, and hollows the experience.