Then perhaps this could be a way for you to lockdown internet traffic to and from your device. Major privacy improvement.

Straight from their site.

NetGuard provides simple and advanced ways to block access to the internet - no root required. Applications and addresses can individually be allowed or denied access to your Wi-Fi and/or mobile connection.

Blocking access to the internet can help:

reduce your data usage save your battery increase your privacy

Edit: Uses the same slot as VPN on a phone. Thus you have one or the other. Not both. PC is different.

Cutoff internet access on all apps that expressly do not need it. Install Netguard or the likes if you don’t used a VPN and see what apps are calling home.

Check out Posteo!