Three APN Settings

Set up Three UK APN settings to fix mobile internet and MMS issues on your device. Three uses the APN 'three.co.uk' with no username or password required. These settings work for all Three UK plans including Pay Monthly, Pay As You Go, and SIM Only on Three's 4G and 5G networks.

Use these settings to configure your Three mobile data connection.

Setting	Value
APN	`three.co.uk`
MCC	`234`
MNC	`20`
Authentication	None
APN Type	`default,supl,mms`
APN Protocol	IPv4/IPv6
Username	Not required
Password	Not required

How to Configure Three APN on Android

1 Open Settings on your Android device
2 Go to Network & Internet or Connections
3 Tap Mobile Network or Mobile Data
4 Select Access Point Names (APN)
5 Tap the + icon or Menu to add a new APN
6 Set Name to 'Three Internet' and APN to 'three.co.uk'
7 Leave Username and Password blank
8 Set MMSC to 'http://mms.um.three.co.uk:10021/mmsc'
9 Set MMS Proxy to 'mms.three.co.uk' and MMS Port to '8799'
10 Tap Save and select the new Three APN from the list

How to Configure Three APN on iPhone/iOS

1 Open Settings on your iPhone
2 Tap Cellular or Mobile Data
3 Select Cellular Data Options
4 Tap Cellular Network or APN Settings
5 Enter 'three.co.uk' for APN
6 Leave Username and Password blank
7 Restart your iPhone to apply changes

Troubleshooting

Common issues and solutions when configuring Three APN settings.

MMS messages fail to send or receive: Three MMS requires the MMSC URL http://mms.um.three.co.uk:10021/mmsc with proxy mms.three.co.uk and port 8799. Ensure all three values are entered exactly as shown. The port number 8799 is different from many other UK carriers.
No data connection on Three: Verify the APN is 'three.co.uk' and not just 'three' or 'internet'. Leave Username and Password completely blank. Authentication Type should be set to None. Restart your device after saving.
Data works on 4G but not on 5G: Ensure the APN Protocol is set to IPv4/IPv6 for dual-stack support. If issues persist, check your plan includes 5G access and that your device supports Three's 5G frequency bands.

Three APN Settings FAQ

What is the APN for Three UK?

The APN for Three UK is 'three.co.uk'. No username or password is required for Three's standard internet connection. The authentication type should be set to None. This single APN handles both internet data and MMS messaging when combined with the correct MMSC, proxy, and port settings.

Does Three require a username and password?

No, Three UK does not require a username or password for APN configuration. Leave both fields completely blank when setting up your APN. The authentication type should be set to None. This is different from carriers like Vodafone and O2 which require login credentials for their APN settings.

What are the Three UK MMS settings?

Three UK MMS settings require the MMSC URL http://mms.um.three.co.uk:10021/mmsc, MMS Proxy mms.three.co.uk, and MMS Port 8799. These must be entered in the same APN profile as your internet settings. Without these values, picture messages will not send or receive even if data browsing works correctly.

What are the MCC and MNC for Three UK?

Three UK uses MCC 234 and MNC 20. These values identify the Three network in the United Kingdom and are typically pre-programmed on your SIM card. Sub-brands like SMARTY and MVNOs like spusu also use MNC 20 as they operate on Three's network infrastructure.

Can I use the same APN for Three Pay As You Go?

Yes, the APN 'three.co.uk' works for all Three UK plan types including Pay Monthly, Pay As You Go, and SIM Only. There is no separate APN for different plan types on Three. If you have recently switched plans and lost connectivity, simply re-enter the APN settings and restart your device.