Longman Dictionary of Contemporary English
phone-tapping
noun
EXAMPLES FROM CORPUS
▪ As the subject cooled, the House took out some of these provisions, notably the broader powers of phone-tapping and surveillance.
Usage examples of "phone-tapping".
Barris has a box of electronic hardware, and even Sony, for example, makes and sells an induction coil that can be used as a phone-tapping device.