From Tardis Wiki, the free Doctor Who reference

A telephone was a communications device used on Earth. It was invented by Alexander Graham Bell. (TV: Father's Day)

Telephones also existed on Mondas at the time of the creation of the Cybermen. (AUDIO: Spare Parts)

In the 21st century, landline telephones were rarely used, except to call and find one's mobile phone. Occasionally, they also came in handy when one's mobile was receiving no signal. Nevertheless, it was standard practice to instal a landline telephone in one's residence, often soon after moving in. (AUDIO: Prisoner of the Ood)

Business settings, such as offices and call centres, also continued using landline connections into the 21st century, often used together with headsets with built-in microphones. (TV: Partners in Crime, The Lodger, AUDIO: Fall to Earth)

The Doctor's TARDIS had a telephone both inside and out in several of its incarnations. The external one was simply a dummy, part of the police box disguise, and yet it was called on several occasions. (TV: The Empty Child, The Bells of Saint John, The Day of the Doctor, The Time of the Doctor, Time Heist)

The miniaturised First Doctor and his companions tried to use Forester's telephone to alert someone to the dangers of DN6, but could not make themselves heard. However, this raised the suspicions of telephone operator Hilda Rowse enough to send her police constable husband Bert to investigate. (TV: Planet of Giants)

In 1968, the Sentience cut off all phone lines from Crook Marsham. (PROSE: Nightshade)

On New Year's Day 2019, a lone Dalek took over the Government Communications Headquarters of Great Britain. In order to divert enough power to make a transmission to Skaro, the Dalek shut down the country's Wi-Fi, phone signals and Internet to power the transmission. (TV: Resolution)

The Master fitted a extra-long phone cable to the Third Doctor's phone in his UNIT lab with the intention of using it (and the Nestene Consciousness' affinity with plastic) to kill the Doctor. (TV: Terror of the Autons)

Vardans were able to transmit themselves down telephone wires. (PROSE: Return of the Living Dad)

On Marius, the Arbitans had invented the telephone. (TV: The Keys of Marinus)