The USA is reported to have a long history of cable tapping, Blind Man's Bluff: The Untold Story of American Submarine Espionage
"For decades American submarines have roamed the depths in a dangerous battle for information and advantage in missions known only to a select few. Now, after six years of research, those missions are told in Blind Man's Bluff, a magnificent achievement in investigative reporting. It reads like a spy thriller -- except everything in it is true. This is an epic of adventure, ingenuity, courage, and disaster beneath the sea, a story filled with unforgettable characters who engineered daring missions to tap the enemy's underwater communications cables and to shadow Soviet submarines."
Contact your ISP, you'll have to get beyond the phone-script crew, and explain the issue to the technical types there. It isn't likely that they will be happy to have someone playing this type of games with their connections and will step in. In most places the ISP can also bring legal charges under a theft of service law.
Not a Motorola Barrage, the Bluetooth system doesn't work very well. After a call made or answered from your bluetooth device the phone may not reconnect to it properly properly and you'll be scrambling for your phone when it rings and your car/headphone remains silent.
The test of intelligent tinkering is to save all the parts. -- Aldo Leopold