0800 678 3110 (telephone number)

0800 678 3110 was the telephone number to the TARDIS telephone at some point during the Doctor's thirteenth incarnation.

She used it during a 21st century invasion of Earth from creatures from all over the universe, when she told the BBC to urge human civilisation to leave her a message if they discovered any alien activity. (PROSE: Have You Seen The Aliens Terms and Conditions) She further left her phone number on blueprints that also showed Weeping Angels and Sontaran Battle Fleets, which were shown all around electronic billboards in the Liverpool areas.

The Doctor left a voice message for whoever called her phone number: "You’ve reached the voicemail of *BEEP* the Doctor. If you’re ringing this, it means enemies from across the universe have arrived on Earth and the battle is coming imminently! Who did you see, and where? I need as much information as possible! Protect yourself. It’s coming. Be ready."

- Voice message from the Doctor