It didn't have to be moved. But they are reasons why it is likely.
In my view Bamber didn't even have to disable the phones upon entrance. June & Nevill were not going to hear a thing prior to him entering the bedroom.
Well Steve seems to think different Adam.And didnt David Boutflour say that Crispy usually slept beside the Aga. JB would have known this was a possibility,and that he may start barking ,so i think he would have considered disabling the phone as soon as possible.