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Majority of Americans now use ad blockers
(www.theregister.com)
This is a most excellent place for technology news and articles.
How do I do that on iPhone?
You can do that by selling it and buying an Android.
Can you use a blocker on Android or is per app the best we can do?
Tracker Control on Android works well for system-wide tracker and ad blocking, and you can configure custom blocking rules per-app. Works without root by using a VPN profile (but no data leaves your device via the VPN, it just routes the traffic through this app).