We have an old rotary phone at camp. Dial tone is gone but you do hear static noise when you pick up the receiver. Switched out the phone and also the cord from the phone to the wall jack. Same results. Called Verizon and they 'pinged' it or whatever and they say all is good on their end. I thought maybe the line got cut or damaged from somewhere between Verizon's box and the wall plate, but then why the static noise?? I don't know anything about copper phone lines. Any suggestions?