Do I need to return internet equipment from T-Mobile Fiber when I close my account?

T-Mobile does require the return of the Equipment that we provided to you (except any optical network terminal that is affixed to a wall, which you agree indefinitely not to remove or damage) within fifteen days of service disconnect unless we notify you that such return is not necessary. A non-return fee of $75 will be applied per device if you do not return the Equipment.