Android’s Private DNS setting is the native way to choose a compatible encrypted DNS provider across networks, including mobile data. That is different from editing DNS on one Wi-Fi profile, which does not automatically change cellular DNS.
Set Private DNS for 4G/5G
- Open Android Settings.
- Search for Private DNS.
- Select Private DNS provider hostname.
- Enter a documented hostname such as
dns.google,one.one.one.oneordns.quad9.net. - Save and test while Wi-Fi is turned off so you know the phone is using cellular data.
Cloudflare’s Android documentation explicitly notes that Private DNS can apply on all networks, including cellular. Menu names differ by manufacturer, but the system behavior is tied to Android’s Private DNS setting rather than a single Wi-Fi network.
Why you cannot just enter 8.8.8.8 for mobile data
Stock Android does not expose a simple “DNS1/DNS2 for cellular” box like a manual Wi-Fi profile. The Private DNS screen expects a provider hostname that supports encrypted DNS. For Google, use dns.google. The 8.8.8.8 address is still valid Google Public DNS, but it belongs to traditional DNS configuration.
See Google DNS on Android for a step-by-step explanation.
Private DNS hostnames worth testing
- Google:
dns.google - Cloudflare:
one.one.one.one - Quad9:
dns.quad9.net - AdGuard public DNS:
dns.adguard-dns.com
What if Private DNS works on Wi-Fi but not 5G?
Test the same hostname with Wi-Fi disabled, then try a second provider. If several known providers fail only on the mobile network, carrier routing or filtering may be involved. Do not factory-reset the phone as a first response.
Also verify that the mobile connection itself works with Private DNS set to Automatic. If Automatic works and every provider hostname fails, the problem is specific to encrypted DNS reachability or policy.
VPNs can override the result
A VPN may send DNS inside its own tunnel and ignore the system Private DNS choice. If you are testing a resolver, disconnect the VPN temporarily or select the DNS resolver inside the VPN’s settings if the app supports it.
Read Private DNS vs VPN for the difference.
Does changing mobile DNS improve 4G/5G speed?
It can change the time needed to resolve a hostname, but it does not increase cellular signal quality, spectrum capacity or your carrier’s throughput. A faster DNS response may make the start of some connections feel quicker, but it cannot turn a slow radio link into a fast one.
How to verify the resolver on mobile data
Turn off Wi-Fi before testing. Then use a provider verification page where available or a DNS testing tool. Quad9 documents on.quad9.net for its service. You can also compare Android DNS behavior with DNS Changer Pro & Speed Test.
Official references
Featured image credit: 5G phone – ZTE Axon 10 Pro 5G (2).jpg by ubahnverleih, licensed under CC0 1.0, via Wikimedia Commons.
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