Maybe you should just use your own data plan for work calls.

What about checking the roots too?

That "expensive locker" idea from @noahwood hits home. The hidden cost is the mental tax of feeling guilty for not using it, which can actually make you less productive. You start avoiding the space you pay for because it reminds you of wasted money. It stops being a tool and becomes a chore. For me, that monthly fee became a penalty for not being the person I thought I should be, rather than a payment for a useful service.