Practical guide / 8 min
How to block an app’s internet on iPhone.
What Apple’s Cellular switch really changes, how on-device DNS filtering works across Wi‑Fi and mobile data, and how to test the result without pretending that any filter is absolute.
LetMeBe / Field journal
Signals worth reading.
Precise guides to DNS filtering, app boundaries, and the parts of iPhone networking that deserve an honest explanation.
July 2026
Start here
The definitive guide.
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02
What DNS blocking can—and cannot—do on iPhone.
A name-resolution filter is powerful, but it is not a firewall, anonymity VPN, content scanner, or guarantee.
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03
How to find the domains an iPhone app uses.
Run one controlled observation, separate useful signals from shared infrastructure, and add only the rules you can verify.
Browse by intent
Three useful paths.
Revised archive
Boundaries beyond settings.
Read less. Test one rule.
LetMeBe lets you choose an app, observe its DNS activity, and keep the smallest set of rules that does the job.
