A variation of the Space-Time Telegraph is a device that is sometimes known as a Super phone. With the right attachment, a radio communications transceiver (such as a cell phone) can be patched into the TARDIS's communications circuit, creating a "superphone." This gives the augmented cell phone universal (and transtemporal) roaming, with the ability to contact a network in another time zone that the TARDIS had previously visited. It can also send and receive text messages.
A TARDIS can also route cell phone signals through local satellite networks allowing it to interface with local networks in new Time Zones and transmit to any other broadcast based communications network in the area. Calls from the "superphone" can also be received by the TARDIS even if its in a different time zone then the caller, assuming the caller knows the number; for example, the number for the Doctor's Type 40 is 07700900461).
In an emergency, the superphone's link with the TARDIS can be modified so that it expands into a fully functional door into the TARDIS. While the capabilities of the Superphone are impressive, the superphone must remain within the same universe as the TARDIS to function. It should be noted that the Superphone's battery has a limited lifespan.
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.