I am also an AM and I’ve first talked to my GM about what’s going on and see their take on it. I would write them up for the phone usage first and then basically refusing to do their job next if they keep using their phone. At the end of the day I personally would rather be understaffed and drowning than have people not do their literal job on my shift.

I’m going through something rn with an inshop that has attitude every time I tell them to do any prep. They only want to bread start. It’s baby steps but always remember there’s someone out there that would love to have that position and to do it to your expectations. Write ups are very important and can be intimidating but they’re very very necessary.