phone tapper(n = noun.person) tapper, wiretapper - someone who wiretaps a telephone or telegraph wire;
is a kind of eavesdropper

cell phone, cellular phone, desk phone, dial phone, extension phone, mobile phone, orinasal phone, phone, phone bill, phone book, phone booth, phone call, phone card, phone company, phone cord, phone jack, phone line, phone message, phone number, phone plug, phone service, phone system, tapper, wire tapper