I'm gonna leave that code for someone who doesn't already have 2 lol.
Reading article... Compiling response... Dehydrating unicorns...
"You only have voicechat to your fireteam"
Nice! :D
English
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As far as Destiny GAME chat, the way I understand it is you only have voice chat with your fireteam, but your total team is up to the maximum size of the mode that you're playing in. For instance he referred to 6 players in X gamemode. But you can always override that with party chat through XBL or PSN.