A NeoGAF user, PetrCobra, has discovered something in regards to voice chat in Splatoon 2. It’s related to a local connection where “you are all connected to the same router and you press a button combination (I think it’s L+R+Left stick). It then uses the router in a LAN configuration”. According to PetrCobra, they tried this out in a pub game of Splatoon 2 last week. They said that “one of us had a microphone on his headphones, and the second we switched into the LAN lobby we heard what he was saying very loudly in our speakers”. By doing so, they discovered that a LAN connection can give players a built-in voice chat with no app required. It can only be done with this method, but it does indicate that a built-in voice chat is in the game in some form.