Danu88’s topic made me realise that currently we can’t hide our callsign. When you enter the game, when you fly from planet to planet, camera always zooms to your position and shows callsign while some people might prefer to hide it. That’s a common practice for streamers, for example, when they don’t want to get contact requests from everyone who watch their stream. Also you can see someone’s callsign through his contacts’ with notifications if you have access to their gameplay video ( is on-line and so on).
Same goes for friend requests in general: you can’t hide your callsign from search list to avoid unwanted requests (but developer(s) can because yes). when tier 120