What are Three APN settings?
| Setting |
Value |
| APN Name | 3internet |
| Username | (leave blank) |
| Password | (leave blank) |
| MMSC | http://mms.um.three.co.uk:10021/mmsc |
| MMS Proxy | 193.113.200.195 |
| MMS Port | 8799 |
| Authentication Type | None |
| APN Type | default,supl,mms |
Access Point Name (APN) tells the handset how to reach Three for internet, picture messaging and tethering.
Three's APN values for Android and iPhone follow, covering every field. When data shows connected yet nothing loads, start with the APN.
How to find APN settings on Android (Three APN Settings iPhone 16)
Recent Android builds keep it under Settings → Network & Internet → Mobile Network → Access Point Names, or Connections on Samsung. Use plus to create, tap to edit.
On Samsung it's Settings → Connections → Mobile Networks → Access Point Names; Xiaomi/Redmi route via Settings → SIM cards & Mobile Networks → Access Point Names.
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Troubleshooting checklist
Android's APN screen for Three, and the values it needs
Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data
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Saving an APN does not activate it — you must select it
On Android, after tapping Save the new APN appears in the list but is not yet active. Tap the radio button (empty circle) next to it so it becomes filled. The profile is only active when the circle is filled. Then toggle aeroplane mode or restart.
How to find APN settings on iPhone (Three APN Settings iPhone 16)
iOS 16 and up keeps it at Settings → Mobile Data → Mobile Data Network. Missing? Three configures the APN itself; a network reset restores defaults.
On some recent iPhones, Three's bundle locks APN editing; only a Three-side update will change it.
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Troubleshooting checklist
iPhone's hiding place for Three's APN settings, greyed fields explained
Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data
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APN field greyed out? Here is why
On Android: the field is locked by a carrier profile. Go to Settings → Network & Internet → Mobile Network → Access Point Names and tap Reset to Default (three-dot menu). On iPhone: the carrier bundle controls the APN — it cannot be edited manually. Contact your network to push an updated carrier profile, or insert the SIM in another phone to test.
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APN values are case-sensitive — enter them exactly
Type every character exactly as shown — no spaces before or after, no capital letters unless listed. One wrong character stops mobile data from working. After saving on Android, tap the radio button (filled circle) next to the new profile to activate it.
Recommended Three APN settings
Fill the APN screen with the Three values below and skip anything absent. Save, reboot, then activate it.
After saving your APN settings, always restart your phone and test a website before making further changes. If you have multiple APN profiles, make sure the correct one is selected (shown with a filled circle on Android).
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Troubleshooting checklist
Where iOS keeps Three's APN screen and why fields lock
Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data
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Fastest way to apply new APN settings
After saving, turn aeroplane mode ON for 10 seconds, then turn it OFF. This forces an immediate network re-registration — quicker than a full restart and equally effective.
Troubleshooting Three APN issues (iPhone 16)
Data not working despite the correct Three APN? Try these in sequence:
1. Cycle aeroplane mode for ten seconds so the phone rejoins Three and reloads the APN.
2. A full restart flushes temporary glitches and activates the new APN.
3. Wipe and re-enter the APN, since a stray character in Three's APN name or MMSC stops data.
4. Do a full network reset — both platforms restore Three's defaults at the cost of saved pairings.
5. Rule out an account issue: SIM activated, account active, allowance intact? Three's hub or support can confirm.
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Troubleshooting checklist
These Three fixes are ordered from quickest to most involved — start at the top
Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data
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Common MMS mistakes that stop picture messages working
• The MMSC URL must begin with http:// — never https://
• The MMS Proxy field is an IP address only — no http:// prefix
• APN Type must contain mms (e.g. default,supl,mms)
• On Android, save then select the profile before testing
APN settings for MMS on Three (iPhone 16)
MMS on Three depends on its own APN fields. When sending or downloading breaks, start there.
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MMS setup checklist
Copy Three's MMSC exactly — http:// only, since https:// breaks MMS
Step 1Check MMSCStep 2Add MMS proxyStep 3Set APN typeStep 4Turn data onStep 5Send test MMS
Frequently Asked Questions About Three APN Settings iPhone 16
Will changing APN settings delete anything?
No. Contacts, messages and apps stay as they are — the APN only sets how the phone reaches Three.
Do I need to enter APN settings on an eSIM?
Most Three eSIM profiles configure the APN themselves. Should data not work, the manual steps apply.
Why is my Three APN greyed out?
Certain handsets ship with the APN locked by Three. Android has a reset-APNs option in Settings → Network & Internet → Mobile Network; iPhone needs a Three carrier bundle update.
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APN field greyed out? Here is why
On Android: the field is locked by a carrier profile. Go to Settings → Network & Internet → Mobile Network → Access Point Names and tap Reset to Default (three-dot menu). On iPhone: the carrier bundle controls the APN — it cannot be edited manually. Contact your network to push an updated carrier profile, or insert the SIM in another phone to test.
More Three APN Settings iPhone 16 Questions
What is the Three APN name?
The Three APN name is shown in the settings table above. On most Three SIMs in the UK, the APN is pre-configured automatically when you insert your SIM.
Why is my Three mobile data not working after entering the APN?
After entering the Three APN settings, restart your phone to apply the changes. If data still does not work, check you have selected the correct APN and that your Three plan includes mobile data.
Do I need to enter APN settings manually on Three?
Most Three devices configure APN settings automatically when you insert your SIM. You only need to enter them manually if your internet or MMS stops working after a factory reset or SIM swap.
What is the Three MMS APN for picture messages?
The Three MMS APN settings are included in the table above. Make sure the MMSC, MMS Proxy and MMS Port values are entered exactly as shown.
Can I use the same APN settings for 4G and 5G on Three?
Yes, the Three APN settings work for both 4G and 5G connections. You do not need a separate APN for 5G — the network upgrades automatically where 5G coverage is available.