• For an Android phone, it's difficult.

    For web stuff, that's easy: Install the Firefox app, and you can add the extension for uBlock to enable ad-blocking.

    For apps... it's very hard. Either you root the phone and install an outbound firewall to give you full control over web traffic and all permissions and phone access. Or you avoid root, but install a VPN and then choose a provider that gives you access over the DNS of the VPN, or run your own VPN.

    To block adverts in apps is hard for novices, but blocking adverts on the web is easily achieved by changing your browser to Firefox.

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