I'm on Three also and it seems to work great. I have a femtocell at home, as a the signal is terrible here, but I find the Wifi Calling generally kicks it at <2 bars signal.
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Might be helpful if you actually stated exactly what the bug is! I can tell from your message that you're not a developer
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Do you consider a completely new filesystem as a 'feature'? Sometimes technical debt must be repaid. This is that occasion....
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It's not so much the battery adjusting, but the charging and battery life reporting calibration. Other than this, yes, a few days' bedding in is required before any sensible observations can be made.
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Highly recommend a fresh install - sorted out a lot of the issues I had with these betas. I don't trust multiple delta updates of beats. After the previous beta completely trashed my iPhone, I did a clean install then restore from iCloud. Since then, battery life and other strange glitches have been a thing of the past.
Doing so means that all apps and system files are installed natively installed on the new APPS file system.