Avoiding situations like this alone is a reason enough to root your phone.
Our privacy is vulnerable as soon as we sign in to an Android phone with a Google account (their entire business is based on ads and playing with the boundaries of the exploitation of our privacy).
Hence, we must be vigilant.
As already suggested Ad-Free is a great program.
Here's a better one that gets updated quite often:
https://play.google.com/store/apps/d...?id=org.adaway
Here's one that trumps them all and is the most useful and criminally underrated app for root users:
https://play.google.com/store/apps/d...JpdHkubGl0ZSJd
Use it to deny unwelcome permissions to all apps.
No reason for 'Battery Calibration' to have access to Wifi and Mobile data other than to display ads and generate revenue.
Use this to disable ads, or any network communication for that matter, in all games and enjoy them clutter free.
If you're apprehensive about disabling anything, simply install it and monitor the permissions' event log. You'll be shocked to see how frequently some apps access your personal info.
Hope this helps.
Sonny
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