phone-tapping
wire tapping AmE
telephone tapping

But they might have her phone tapped and trace his call to find him.

The black man nodded, tapped the phone with his finger.

They must have guessed Jones was being watched and his phone tapped.

The authorities could be watching the old man, could even have his phone tapped.

This seems to be wrong legal position as in India there is no requirement to obtain a court order to do phone tapping.

The regulation of phone tapping in the Council document was incomplete and therefore inadequate.

It is reported that while in opposition, he was subjected to covert surveillance, including phone tapping.

During martial law in Poland, official censorship was introduced, including open phone tapping.

It avoids the legal requirements needed for phone tapping.

Foreigners were watched with special care, their phones tapped and their cars often followed.