Hi. I have an iPhone 6s plus and my battery was and its still very good. Recently I decided to turn on Wi-Fi calling feature just to test this out for a couple of days. When I dont do any calls, the battery seems to be the same, but today, before I make a call, I was at 90% and after the call (who last 1h38min) the battery was at 71%. Is it normal? Losing 19% of battery life for a 1h38min call seems higher than normal phone calls. So I want to know if Wi-Fi calling drains more battery when you actually do a phone call, and if you leave this option on all the time? is it a feature meant to be always on? My carrier support VoLTE so is it better to just use cellular network? I live on a house and most of my calls are on a basement with 2 bars reception, normally I have 3-4 bars when I'm upstairs. Thanks!