Recently I bought a Samsung Galaxy S7. I had an S6 Edge, and no problems with Android OS data usage/battery drain.
The big problem is, I don't know why, but Android OS is eating my mobile data and wi-fi data, and my battery too!!!
I have the same apps of my S6 edge on the S7, I'm reading all topics on the internet, but no success. Please see the screenshots! Thanks!
I restricted almost everything from backgroung, installed Doze, installed Greenify, I'm trying everything, but this ANDROID OS keeps eating everything!
Sorry about my english, I'm from another country.
Please ignore the Google Play Store usage in the second screenshot (it is already set to auto-update on WiFi only; that usage was done on purpose one day that my Wi-Fi was offline, and I wanted to test my 4G). The big problem is my battery drain about android OS and data usage. Play Store is fine, no more usage.