Question About T-Mobile Insurance?

Okay, So i have 5 Lines in my family plan.
So my sisters line was eligible for an upgrade, so then i ordered a phone using her line.
But i wont be using the phone on her line but mine.
Will the insurance on my line cover the phone?
Or will it only cover it if i use my sisters line?
Her line and mine both has insurance..
I really want to use the phone on my line, i dont wanna have to switch phone numbers with her.

T-Mobile Insurance Info

honestly just call T-mobile, they will tell you how it works. if you are nervous you can always say that you have an extra phone and are thinking of moving to it, and getting the information about how the insurance works that way? o.o