I believe the OP asked about voice chat though The game does not support the voice chat so you'd need to use either some 3rd party PC chat tool (like team speak) ot you can also use the PS4's / Vita's Group chat however that would be limited to PS4 players only. In regards of the 30 days - it's added automatically to your account once you activate the game (otherwise you'd unable to play at all). To check the current amount of the sub days and to add more visit Mogstation. Welcome to the FF XIV world!