The primary form of galactic communication, tachyonic communications utilize an advanced form of photonic virtual particles called 'tachyons', which travel much faster than the speed of light due to only a limited interaction with the universe, and when energized enough, can travel the expanse of the entire galaxy in a near instant. The most effective form of FTL communication, the discovery of tachyons and its uses has been perhaps one of the most influential discoveries in the entire galaxy, allowing people to communicate across the galaxy without needing to travel to their destination.
However, tachyonic communication comes with its own drawbacks; it is an expensive process to create tachyons and requires the use of exotic metamaterials to do so. In addition, the generation of tachyons involves little output, causing tachyonic communication to be extremely low-bandwidth - this issue is solved via the construction of tachyonic arrays throughout the galaxy that can communicate even terabytes of information per second, ultimately making up the web that is the Galactic Nexus. Because of the bulk required for tachyonic communication, it is only done in relay station that are built for it; thus, a single device cannot perform tachyonic communications and relies on oftentimes radio communication that relays messages to the local tachyonic array or comm station, an expensive building to construct in a hub. Most ships are also equipped with ship tachyonic comms, lower bandwidth antennas or arrays that allow communication through tachyons, but in a short radius.
Because of these drawbacks, one may only access the Galactic Nexus and communicate across distances faster than light using a connection via a nearby tachyonic comms station.