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APN Not Working? Fix Mobile Internet & MMS

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APN settings not working? Step-by-step fixes for the 8 most common UK mobile internet and MMS problems. Covers Android and iPhone.

Quick setup summary (APN Not Working? Fix Mobile Internet & MMS)

Getting the correct APN Not Working? Fix Mobile Internet & MMS Settings (UK) setup can improve mobile data speed, MMS messaging, and network stability on your device.

You've entered your APN settings and mobile internet still isn't working. Before calling your carrier, work through this guide — the fix is often something small. These are the eight most common causes of APN-related mobile data failure in the UK, in order of how often we see them.

This is the single most common APN mistake. On Android, entering APN values and tapping Save does not automatically activate the APN — you must also select it from the list by tapping the radio button (filled circle) next to your new entry.

Go to Settings → Mobile Networks → Access Point Names

Tap the radio button (○) next to it so it becomes selected (●)

If you see multiple APN entries (some may have been pre-loaded), make sure the one you created — with your carrier's correct values — is the one that's selected.

APN values are case-sensitive and must be entered exactly. A single misplaced character — including a trailing space accidentally typed after the value — will cause the connection to fail. Common mistakes include:

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Troubleshooting checklist

Sequential order works better than skipping to the finish

Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data

Recommended setup checks (APN Not Working? Fix Mobile Internet & MMS)

Check the APN profile in Mobile Network or Cellular Data, save, restart, and confirm browsing, MMS and hotspot are working correctly.

Internal guides to check next

UK APN SettingsEEO2VodafoneThree MobilegiffgaffTesco MobileSky MobileBT MobileiD Mobile

Frequently Asked Questions About APN Not Working? Fix Mobile Internet & MMS

Why is my APN not working after I saved it?
On Android, saving an APN is not always enough. Open Access Point Names again and select the new APN using the circle next to it, then restart the phone or toggle aeroplane mode.
Should I reset network settings if mobile data is not working?
Use network reset only after checking the APN text, selecting the saved APN, restarting the phone and testing the SIM. A network reset can remove saved Wi-Fi passwords, Bluetooth pairings and VPN settings.
Why does MMS still fail when mobile internet works?
MMS often needs separate fields such as MMSC, MMS proxy, MMS port and APN type. Check your network MMS guide and make sure mobile data is switched on before sending a picture message.
Do iPhone users need to enter APN settings manually?
Many UK iPhones receive carrier settings automatically, but manual APN fields may still appear under Mobile Data Network on some plans or unlocked phones. Restart the iPhone after any change.
When should I contact my network provider?
Contact your network if the correct APN is selected, mobile data is enabled, the SIM works in another phone, and there is no local outage. The account or SIM may need refreshing by the provider.