To change DNS settings on iPhone, open Settings > Wi-Fi, tap the information button beside the connected network, select Configure DNS, choose Manual, and enter the trusted server addresses. That control exists only for Wi-Fi: iPhone has no DNS field for cellular data, so mobile data uses your carrier's resolvers unless a DNS profile, a DNS app, or a VPN supplies others. Record the original Automatic or Manual state and every existing address first, test on the same network, and restore the recorded state if the change does not produce a clear improvement.

Key Takeaways

The setting belongs to one saved Wi-Fi network, not to every iPhone connection.

Record the original mode, addresses, and order before editing.

Use only resolver addresses supplied by a trusted administrator or provider.

A DNS change is not a cellular-DNS, encrypted-DNS, VPN-DNS, or MDM-profile change.

Verify the same names before and after; restore the original state if the result is unclear.

If the phone cannot reach anything at all, first use the iPhone Wi-Fi no-internet guide. DNS is only one layer in the broader device and app troubleshooting guide.

Should you change DNS settings on iPhone for this connection problem?

DNS translates names such as a website hostname into network addresses. A DNS problem can make several unrelated names fail while the phone remains joined to Wi-Fi. It does not explain weak signal, a router with no internet service, an unfinished captive portal, an expired account, or one app having an outage.

Run a small scope check before editing:

Observation	More likely layer	Better first action
Several unrelated hostnames fail only on one Wi-Fi network	DNS or that network's policy	Compare another trusted network and review DNS
Every device on the Wi-Fi network is offline	Router, modem, or provider	Troubleshoot the shared network
Only one app or one site fails	App, account, destination, or filter	Test another app and unrelated names
Wi-Fi works but cellular data fails	Carrier, plan, SIM/eSIM, or cellular settings	Use cellular troubleshooting
The failure began with a VPN, proxy, or management profile	That configuration may own routing or resolution	Review its supported settings

Changing to a public resolver is not a guaranteed speed or privacy upgrade. Results depend on the network path, resolver operator, caching, transport, and destination. This guide therefore does not recommend a particular public DNS service or present DNS as a way to bypass network rules.

What should you record before changing DNS?

Open Settings > Wi-Fi and tap the information button next to the connected network; Apple's iPhone User Guide places Configure DNS, HTTP Proxy, and the network's Use Connectivity Assist switch on that page.［1］ Apple also documents Configure DNS among the advanced options available from a network information page during iOS Setup Assistant.［2］ Confirm the current labels on your own screen before touching Configure DNS, then record:

The Wi-Fi network name, without copying its password.
Whether Configure DNS is Automatic or Manual.
Every visible server address and its displayed order.
Whether the device is supervised or shows a management profile.
Whether a VPN, security app, or encrypted-DNS profile is active.
Whether Use Connectivity Assist is on for this network.

Do not delete a configuration profile, certificate, VPN configuration, or device-management control to make the field editable. Apple documents DNS settings that organizations can deploy through device management; those settings have a different owner and scope from this Wi-Fi page.［3］ If a work or school device is managed, or if values return after you change them, stop and ask the administrator.

1. Open DNS settings for the correct Wi-Fi network

Join the Wi-Fi network you intend to test.
Open Settings > Wi-Fi.
Confirm the checkmark is beside the intended network.
Tap its information button.
Scroll to Configure DNS.

Editing another saved network will not change the active connection. The setting also does not automatically apply to mobile data, another Wi-Fi network, Personal Hotspot, or a VPN tunnel. Repeat this distinction whenever you compare results: first name the connection that is carrying traffic, then name the owner of its DNS policy.

2. Switch from Automatic to Manual DNS

Use Manual only when you have exact IPv4 or IPv6 resolver addresses from a trusted source.

Tap Configure DNS.
Select Manual.
Keep your recovery note available.
Under DNS Servers, tap Add Server.
Enter one exact address per entry.
Add any additional approved address separately.
Remove only a manual entry you have confirmed should be replaced.
Preserve the intended displayed order; if the current iOS version provides reorder handles, arrange entries according to the owner's instructions.
Tap Save.

Do not enter a website URL, proxy hostname, PAC URL, search phrase, or credentials in this list. Do not copy addresses from an unknown “fastest DNS” page. A resolver can observe the names it receives and influence answers, so its ownership and policy matter.

If you need to remove one address, first compare it with your recovery note, delete only that entry, and save. Avoid changing several layers—DNS, proxy, VPN, and router settings—at the same time, because a later success would not identify which change mattered.

3. Verify the result on the same network

A single page loading once is weak evidence. Use a repeatable before-and-after check:

Stay on the same Wi-Fi network.
Leave Use Connectivity Assist in its recorded state; when it is on, iPhone can add cellular data while Wi-Fi is weak, which mixes two DNS paths in one test.
Close and reopen the affected browser or app.
Test the hostname that failed and two unrelated known-good hostnames.
Confirm that a captive sign-in page is not still waiting.
Check whether the symptom affects only one app, a VPN session, or all apps.
Note the time and exact error rather than relying on “it feels faster.”

For a cleaner comparison, keep the iPhone in one place, leave the router and other network settings unchanged, and use the same browser session pattern for both runs. Do not use a resolver benchmark as the only acceptance test: a benchmark can measure a narrow lookup sample while the original app depends on different names, cached answers, or organization-only records. The goal is to explain the reported failure without creating a new one, not to produce the smallest synthetic latency number.

Treat the DNS change as useful only if the previously failing names now resolve consistently and known-good destinations remain healthy. A reconnect, cache change, restored router link, or completed portal sign-in can coincide with the test. If the evidence is mixed, restore first and continue isolating the actual layer.

4. Return to Automatic DNS or restore the old manual list

To return to network-supplied DNS:

Open Settings > Wi-Fi > [network information] > Configure DNS.
Select Automatic.
Tap Save.
Reopen the affected apps and repeat the baseline checks.

If the original mode was Manual, do not switch to Automatic by assumption. Remove only the test addresses, re-enter the recorded original addresses, restore their order, and save. If the page changes back by itself or remains locked, a profile, VPN, security app, or administrator may own the policy. Repeatedly overwriting it can break access to internal services.

How do you change DNS for mobile data on iPhone?

Settings has no Configure DNS field for cellular data, so mobile data normally uses the resolvers your carrier assigns. To change DNS for mobile data on iPhone, a system-wide owner has to supply the setting instead of the Wi-Fi page:

A DNS profile you install yourself. Apple's documentation for the DNS settings payload says a manually installed profile also applies to cellular networks, while the same payload installed through device management applies only to managed Wi-Fi networks.［4］
A DNS provider's app. An app that uses Apple's DNS settings API saves a configuration that stays inactive until you enable it in Settings.［5］
A VPN. While it is connected, the VPN configuration can supply its own resolvers for traffic that uses the tunnel.

Install a profile or app only from a resolver operator you have deliberately chosen, because it receives lookups on every network it covers. Profiles you installed appear in Settings > General > VPN & Device Management, and deleting a profile also deletes the settings, apps, and data associated with it.［6］ To turn off DNS on iPhone that a profile or app added, remove the profile you installed or disable the configuration in the provider's app, then retest on both Wi-Fi and mobile data. Leave a work or school profile in place and ask its administrator.

Understand what this setting does not change

The Wi-Fi DNS page is deliberately narrow:

It does not set a universal resolver for cellular data.
It does not create encrypted DNS by itself.
It does not override every VPN's DNS policy.
It does not remove device-management DNS settings.
It does not configure an HTTP proxy; use the iPhone proxy settings guide for that separate layer.
It does not improve Wi-Fi radio strength or repair an upstream outage.

If the problem follows the iPhone across multiple trusted Wi-Fi networks after reversible checks, collect the network names, errors, tested times, and ownership of VPN/profile settings. A network settings reset is a last resort because it forgets much more than DNS.

Summary

Change DNS only for the specific Wi-Fi network whose behavior you are testing. Preserve Automatic or Manual state, every address, and order; add only trusted resolver addresses; compare the same destinations; and restore the original configuration if there is no clear benefit. Keep cellular, encrypted DNS, VPN, proxy, and managed-profile settings as separate owners rather than assuming this one page controls them all.

FAQ

Where are DNS settings on iPhone?

Open Settings > Wi-Fi, tap the information button beside a saved network, then tap Configure DNS.

Does an iPhone DNS change apply to mobile data?

No. Configure DNS belongs to the selected Wi-Fi network. On mobile data, DNS comes from your carrier unless a DNS profile, a DNS app, or a VPN supplies it.

Should I choose Automatic or Manual DNS on iPhone?

Use Automatic for network-supplied settings. Use Manual only when you deliberately have trusted resolver addresses and a recovery record.

Can I add both IPv4 and IPv6 DNS servers?

Yes, if the trusted provider or administrator supplies them. Enter each exact address as a separate server.

Does changing DNS always make an iPhone faster?

No. Performance varies, and many connectivity problems are not DNS problems at all.

Does manual DNS make browsing private?

Not automatically. Resolver ownership and transport matter, and DNS is only one part of the connection path.

Why do DNS settings change back?

A network, VPN, security app, configuration profile, or device-management policy may be supplying them. Identify the owner instead of fighting the setting.

When should I reset network settings instead?

Only after the problem follows this iPhone across networks and lower-risk checks fail. Read the reset side effects first. Changing an iPhone's DNS resolver is not the same as using a VPN; test the selected resolver first, and do not expect a VPN to repair a mistyped DNS address.

Sources

Apple iPhone User Guide — Manage Wi-Fi settings on iPhone — https://support.apple.com/en-sg/guide/iphone/iphw5gjwl8k2/ios
Apple Support — Set advanced network settings in iOS Setup Assistant — https://support.apple.com/en-ie/102108
Apple Platform Deployment — DNS settings device management payload settings — https://support.apple.com/en-au/guide/deployment/dep86469ba99/web
Apple Developer Documentation — DNSSettings — https://developer.apple.com/documentation/devicemanagement/dnssettings
Apple Developer Documentation — NEDNSSettingsManager — https://developer.apple.com/documentation/networkextension/nednssettingsmanager
Apple iPhone User Guide — Install or remove configuration profiles on iPhone — https://support.apple.com/en-sg/guide/iphone/iph6c493b19/ios

Sources checked 4 October 2026.

How to Change DNS Settings on iPhone