Not the OP. But as I understand you would be able to see all the outgoing requests. And thus how much your device phones home.

Considering it's an adblocker app, I'd imagine you'd specifically see all the times it tries to ping back to ad companies.

Install the app. Then close all apps and don't browse any sites for 1 hour.

Then open the app and check the logs. Just see if it phones home to Facebook, Taboola, Google, Adjust and some other 200 or so companies.

When you say "phone home", how can we determine what kind of info is it sending to places like Facebook, Taboola, etc?

What does "phone home" actually mean?

In most cases this comes from mobile ad/analytics frameworks (Facebook Ads/SDK, Google AdMob, StartApp, Chartboost, MoPub, etc. etc.).

They usually ping back with usage counters and probably other analytics data. In many cases those SDKs even join data between apps on your device (e.g. you give your age to app A, your name to app B, your location to app C and they merge it on the backend). This data is then shown to users and in a lot of cases also sold in bulk.

Note that most of these frameworks target iOS first and Android second - due to population and revenue.