I don't understand how it works.
The reasons touted is to avoid using bulky headsets, which in the house isn't an issue so must be for outside etc.
If you're outside how do you voice chat via phone using headphones whilst also using headphones to hear the game. Will game sound route through to the phone? Or do you have to have one out loud regardless?
Lastly what about data usage, do you use phone network to stream voice etc?
I can't fathom out the practical application.