What going on , after update my battery going down very fast, I hope Apple will fix this problem / bug really fast, any body have the same issue ?!
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Your phone could be using wifi assist if you're in a building with a bad signal, maybe that's the problem? You can go to settings > cellular, and scroll all the way down and turn off wifi assist. Just throwing an idea out there. It may help, it may not.
No, turned that off straight away after my data jumped from an average of 5gb/month to 5-6 in 4 days. Weird because in those days I was always in strong signal areas!