At work, we use slack, and zoom together to communicate, that's the standard across our team. You need to call someone? Message them on slack and then give them a voice call… Well, my boss often calls my personal phone during work hours, typically when I'm really busy focusing on something that's critical or needs to get done that's very important. Doesn't message me on slack at all or call me, just goes right to my personal phone… This usually leads me to believe that they are not actually at their desk during business hours, they are out doing something. Half the time, they show up to meetings that they have scheduled and they are in their car You can hear their turn signal, or other background noise and you know they are definitely not at their desk doing work during business hours…
I consider it highly unprofessional to call someone's personal cell phone during business hours but wanted to know if this is standard for everyone else?