The thing is though. Here at least in the UK, there are not many data tariffs that are unlimited. If it was enabled by default and a user was using FaceTime Audio often and for long calls, this could quickly use all of their data allowance up.
Get yourself onto Three. Good quality unlimited data.
Hi
I'm just wondering how Facetime audio compares to HD voice for anyone who's tried both.
I'm on 4G in the UK as are all other iPhones in the house and to be honest i cannot notice and difference in quality to regular calls, HD voice apparently works with no intervention if both parties are on 4G with compatible handsets.
You're right, HD Voice just happens when both parties are on HD Voice handsets. But I think FaceTime audio is still higher quality, having used both.