Three Mobile APN Settings for UK

Own network (Three) 5G supported

Last verified: July 2025

Three Mobile (stylised as 3) is one of the UK's four main mobile networks and is known for its competitive data plans and strong 5G rollout. Three is owned by CK Hutchison Holdings and merged its network with Vodafone UK in 2024. Three's APN — three.co.uk — is clean and simple, requiring no authentication credentials. A notable Three quirk: the MMS Proxy is a hostname (mms.three.co.uk) rather than an IP address — enter it exactly as shown. Three also uses MMS port 8799 rather than the more common 8080. These settings apply to all Three contracts, SIM-only plans, and pay-as-you-go SIMs.

Three Mobile APN Settings

NameThree Mobile
APNthree.co.uk
MMSChttp://mms.um.three.co.uk:10021/mmsc
MMS Proxymms.three.co.uk
MMS Port8799
MCC234
MNC20
Authentication typeNone
APN typedefault,supl,mms
ProtocolIPv4/IPv6

How to Set Three Mobile APN on Android

  1. Open Settings on your Android phone.
  2. Tap Connections (Samsung) or Network & Internet (stock Android / Pixel).
  3. Tap Mobile networks.
  4. Tap Access Point Names (APN).
  5. Tap the ＋ (plus) button to add a new APN entry.
  6. Enter each value from the table above exactly as shown.
  7. Tap the ⋮ menu (three dots) then tap Save.
  8. Tap the radio button next to the new APN to select it.
  9. Restart your phone or toggle Aeroplane Mode on then off.

How to Set Three Mobile APN on iPhone / iOS

  1. Open the Settings app.
  2. Tap Mobile Data (or Cellular).
  3. Tap Mobile Data Network (or Cellular Data Network).
  4. Under Mobile Data, enter the APN value shown in the table above.
  5. Scroll to the MMS section and enter the MMSC, MMS Proxy and MMS Port values.
  6. Press the Home button or swipe up — iOS saves automatically.
  7. Toggle Aeroplane Mode on for 10 seconds, then off.
  8. Test by opening a website in Safari.

Which Phones Do These Settings Work On?

These Three Mobile APN settings work on all Android phones (Android 8+) and iPhones (iOS 14+). They apply to all Three tariffs including SIM-only, pay monthly, and pay as you go. For Android 12+, navigate to Settings → Network & Internet → SIMs → Access Point Names.

Three Mobile APN Troubleshooting

Three SIMs can push automatic configuration. Remove and reinsert the SIM to reset the lock, or reset network settings via Settings → General Management (Samsung) or Settings → System → Reset options (stock Android).
Confirm the APN is selected and mobile data is enabled. The Three APN is simply three.co.uk — no username or password required. Check your Three account hasn't reached its data limit. Three uses zero-rated data for certain services even when you run out, but general browsing requires active data allowance.
Three's MMS proxy is a hostname: mms.three.co.uk. Some phones require an IP address for the MMS proxy field — if you have issues, try leaving the MMS Proxy field blank and only entering the MMSC URL. Port must be 8799.
Three can push OTA configuration. Contact Three and ask them to disable this for your number. Resetting network settings entirely then re-entering may also help.
Check MNC is set to 20 — this is Three's network identifier and getting it wrong will cause connection failures. Also verify Protocol is IPv4/IPv6, not IPv6 only.
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