So, I'm going to show a phone that my characters would use. I haven't actually introduced the thing into my comics yet, or given it a cool name, but revealing what it looks like and how they use it's a start. It's like the "Nintendo Switch" of smartphones. (Excuse the amateur-ish hand drawings)
Acts like a flip phone. External touch screen acts like a clock when open, can be used as a viewfinder, message reader or music player when closed with calling/arrow buttons.
Button to push hinge back will allow the back screen to slide down from the [back-lit] QWERTY keyboard to the chin with speaker.
So, what do your characters' phones look like? If they don't have a phone, do they have other ways of communication or other things that work like a phone? You can comment on others if you like.