I have a pc and would like to play this time on / with mobile players / servers.
However, I have no way to let a cell phone in the lobby join
Now my question is there's a trick that I can play on mobile phone servers?
That's what it's not like that. The operation is much easier on the PC and thus you would have an advantage over the other players. Be fair.
Yes and no that is not possible on the one hand because Epic Games has implemented a matchmaking system which ensures that if you play with keyboard you automatically land in PC lobbies
There's an option: you have to be in a lobby with a cellphone player and he must have the crown so be the admin