Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone
I had the issue running 9.1 and the 22.1 carrier settings, downgrading to 22.0 and the problems went away.
9.1 and the latest carrier settings 22.5.2 seem to work fine but be wary of upgrading to the 9.2 beta.
My iphone 6S+ running the 9.2 beta along with 22.5.2 has exactly the same issue of heat and a battery that constantly depletes, in 3 hours this morning the phone dropped to 40% battery with minimal normal usage (I would expect it to be around 85% still at this point in the day).
Downgrading the carrier settings to 22.0 no longer seems to work, the update through iTunes runs through and it says carrier settings updated but the carrier settings on the phone remain at 22.5.2.