Phones are allowed — just not everywhere, and not for everything.
General guide:
Music, timers, workout apps: Use them anywhere
Phone calls: Take them in the lobby or reception areas
Filming: Only where you’re not capturing other members (e.g., quieter corners, not the locker room)
Locker rooms, showers, class spaces: No phones — ever
Keep it respectful. If it disrupts the space, it’s not the place.