Communications device

A communications device, in the context of the PPC, is any one of several technological devices carried by Agents to maintain voice contact with Headquarters in case of emergencies, as well as with each other at a distance (provided the canon's tech level will allow it). Colloquially, they are sometimes called "comms devices", or just referred to as "comms" for short. Though there are exceptions, most devices cannot as a rule manage cross-world contact, and as such have to be modified with KI technology by DoSAT before they can be properly used.

If in a world with pre-World-War-II levels of technology (as that was the rough time period when handheld two-way radios began to appear), Agents are advised to refrain from using their comms devices altogether except for contacting Headquarters in emergencies.

Cellular Phone
A mobile phone, commonly referred to as a cellular or cell phone, is a wireless telephone that typically operates off a cellular network of broadcasting and relay antennae. Though popular on Earth-One, these phones will not normally work except on Earth-One or in other places with similar intricate antenna networks. If modified by DoSAT, on the other hand (or The Doctor), these phones become capable of working practically anywhere in the multiverse thanks to the PPC's plothole technology.

Comlink
A comlink is a communications device from the Star Wars continuum, used to transmit voice signals much like a cellphone or two-way radio. There are numerous models of varying sophistication and power, and they are often clipped onto headsets for hands-free communication (such as between starfighter pilots). Some forms can even be implanted under the skin, though this is quite uncommon. Without satellite amplication, however, comlink signals are relatively short-range, and this range decreases even further in urban environments. Hence, DoSAT modifications are required for comlinks to be usable as proper comms devices.

KI
KIs themselves technically count as comms devices, being capable of voice contact and cross-world communication. However, the KI's design is rather eye-catching compared to other, more subtle devices, and depending on who you ask this has made it either more popular or less popular than alternative forms.

Two-Way Radio
A two-way radio is a radio set that contains both a transmitter and a receiver, making it capable of both sending and receiving radio-wave messages. This can technically refer to any set of any size, but in the PPC it usually refers to the handheld variant, also known colloquially as a walkie-talkie. Infrastructure Departments and Security Departments tend to use walkie-talkies and a private channel for in-HQ coordination, but Agents have been known to use modified walkie-talkies as their preferred comms devices-- usually, in canons where such devices are commonplace; usually real-world canons, and especially crime shows. Walkie-talkies used by Agents as comms devices have been modified by DoSAT to use plothole technology, so that they can contact HQ from anywhere in the multiverse.