Three APN Settings
The Three APN is three.co.uk. Copy the values below into your phone's APN settings.
Verified October 2026
Three internet & MMS settings
Tap any value to copy it straight to your clipboard.
How to enter APN settings
Open Access Point Names
Go to
Settings → Network & Internet → Mobile network → Access Point Names. On some phones it's underSettings → Connections → Mobile networks.Add a new APN
Tap + (or the menu → New APN) and set APN to
three.co.uk. Fill any other non-blank values from the table above and leave the rest as default.Save and select it
Save from the menu, then select the new Three APN and toggle Airplane Mode on for ten seconds so the change takes effect.
Open the APN screen
Tap
Settings → Mobile Service → Mobile Data Network. On some iPhones the menu is called Mobile Data. If you don't see this option, Three locks APN editing, so contact them or install a carrier profile.Enter the APN
Under Mobile Data, set APN to
three.co.uk. Leave Username and Password blank unless the table above lists them.Save and restart data
Go back to apply the change, then toggle Airplane Mode on for ten seconds so the iPhone re-registers with Three.
Common issues
Data works but MMS won't send. Check the MMSC and MMS proxy values exactly, and make sure mobile data is on. Three uses a hostname proxy (mms.three.co.uk) rather than an IP, so a typo there is a common cause of MMS failing while browsing still works.
No data on a router, MiFi or imported phone. Try the alternative APN 3internet for broadband-style devices, enter it by hand, and restart. Unlocked phones often skip Three's automatic setup.
Settings reset after an update. A software update occasionally clears the APN. Re-enter three.co.uk and the MMS values.
Frequently asked questions
Do I need to enter Three APN settings by hand?
Usually not. Three owns its network, and most phones pull the settings automatically. You enter them manually when data or MMS stops working, often after a SIM swap, a factory reset, or moving the SIM into an unlocked phone.
How do I know it worked?
Turn off Wi-Fi and open any website. If it loads, data is working. For MMS, send a photo to a friend and confirm it goes through. A quick restart helps if either doesn't start right away.
Does Three support eSIM?
Yes. Three supports eSIM. Activation usually sets up the data settings automatically, so you rarely touch the APN on an eSIM line.
Why won't my iPhone let me edit the APN?
Many carriers manage the iPhone APN through a hidden configuration profile, so the fields are locked or missing. That's normal. Resetting network settings re-pulls the profile and fixes most iPhone issues without manual entry.
These settings didn't fix it. What now?
Restart the phone first. If data still won't connect, reset network settings and let the carrier re-provision. If only MMS fails, re-check the MMSC and make sure mobile data is on. APN settings can't fix a deactivated line, an unpaid balance, or a locked phone.
