Phone-tapping is the activity of listening secretly to someone's phone conversations using specialelectronic equipment. In most cases phone-tapping is illegal.
There have also been claims of continued phone-tapping and bugging.
2. See also tap
phone tapping in British English
(fəʊn ˈtæpɪŋ)
noun
the activity of listening secretly, usually illegally, to someone's phone conversations using special electronic equipment
There have also been claims of continued phone-tapping and bugging.