A/c to this, a hard tap does not require access to the actual phone, simply to the phone line.

"Hardwired Wiretap. A Hardwired Wiretap entails gaining physical access to a section of wire that the signal (i.e. telephone line) travels on. Usually, a second set of wires is attached (normally through the use of an isolation or slave device), the signal is then bridged back to a secure location. This type of wiretap when discovered is fairly easy to trace back to the listening post. it is a very common method that is used by law enforcement agents and is usually outside the scope of most eavesdroppers. If the eavesdropper is using a "slave" or similar isolation device on a telephone, the tap will be virtually impossible for anyone to detect"
https://www.coursehero.com/file/208062566/WIRE-TAPPINGdocx/

"Si vous entendez une tonalité sourde, faible mais continue, cela suggère que quelqu’un a branché un dispositif d’écoute « esclave » sur votre ligne téléphonique."
https://desgeeksetdeslettres.com/signes-que-vous-etes-survei...

"Ce que tu veux créer c'est une écoute esclave parallèle. حسنا ما تحتاجين تكوينه هو شريط تنصت بديل"
https://www.tarjamaan.com/fr/translation/ar-fr/تنصت

physique ou matériel, à la différence d'un dispositif à distance (logiciel) piratant la ligne et non les appareils