First of all - i do not use much mobile data when on the move. Had the same subscription plan for years and never ran low on mobile data.
But a few weeks ago i installed a ring camera. This lets me view live video from my yard on my phone.
After having tested the camera just after installing it - it got a text from my provider that i was almost out of mobile data.
That was funny i thought, since i was at home, and connected to my WIFI network.
After investigating what app draws data, and checking the WIFI data tab and the Mobile data tab - ALL data on my phone, chrome, ring, etc etc have been pulled over mobile network. Even when at home, at friends or at work. All places where i am connected to wifi. (to clarify, the log shows all data going over mobile data well before the ring cam was installed - as far as i can see it has never used wifi).
I talked to my brother who got the exact same phone (bought on my recommendation) - but lives in a different house, with a different router, etc. - he has the exact same problem!
Now we both have tried all kinds of options turned on and off. First suspect was WIFI+ . On or off makes no difference. Voice over LTE - on or off - makes no difference. Also tried to force it to only use 3G - no difference (have excellent 4G LTE coverage in my house).
Also - if i DO turn off mobile data completely - it pulls data over wifi just fine. No problem at all. Turn back on mobile data - all data again goes over cell network.
Shouldn't make a difference but both me and my brother is on high speed fiber network with high end routers.
Have anybody experienced anything similar? Any solutions?