How to open APN settings on Samsung Galaxy (Three)
| 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 |
The APN is what lets a phone talk to Three's network for data, MMS and hotspot. Get it wrong and pages won't load.
These are Three's suggested APN settings across both platforms. If data connects but pages won't load, check the APN first.
Entering Three APN values on Samsung Galaxy
Android 10+ route: Settings, Network & Internet (Connections on Samsung), Mobile Network, Access Point Names.
Samsung Galaxy keeps Three's APN at Settings → Connections → Mobile Networks → Access Point Names, while Xiaomi and Redmi differ.
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Troubleshooting checklist
The Android route to APN settings, plus what to type into each field
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.
APN settings greyed out on Samsung Galaxy (Three)
For iOS 16 onward, look under Settings → Mobile Data → Mobile Data Network. Its absence means Three handles the APN automatically.
Heads up: Three's carrier bundle can disable the APN field on newer iPhones.
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Troubleshooting checklist
The iPhone location of Three's APN settings, with greyed fields covered
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.
Testing your Three connection after saving APN — Three APN Settings Samsung Galaxy
These Three values go into the APN settings screen exactly as listed. Save, restart and choose the profile.
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
Reaching Three's APN screen on Android, and completing every field
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 (Samsung Galaxy)
If Three's APN values haven't fixed it, run through the following:
1. Switch aeroplane mode on briefly then off, forcing reconnection to Three.
2. Power the phone down and up again, clearing transient faults.
3. Recreate the profile from scratch; a single typo is a common cause of failure.
4. Wipe network settings entirely; Three's default APN is restored afterwards.
5. Look at the account side. Activation and remaining allowance can be checked through Three's hub.
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Troubleshooting checklist
On Three, going in order usually fixes things within the first steps
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 (Samsung Galaxy)
Within Three's APN profile, MMS has separate MMSC, proxy and port fields worth verifying first.
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MMS setup checklist
Enter the MMSC precisely: http:// is required, https:// stops picture messaging
Step 1Check MMSCStep 2Add MMS proxyStep 3Set APN typeStep 4Turn data onStep 5Send test MMS
Frequently Asked Questions About Three APN Settings Samsung Galaxy
Will changing APN settings delete anything?
No — the rest of the phone is unaffected. This only controls the Three connection for internet and MMS, and it's reversible.
Do I need to enter APN settings on an eSIM?
Correct APN settings normally ship with a Three eSIM. When data is dead regardless, enter the values by hand.
Why is my Three APN greyed out?
A locked APN field is common on some Three devices. Try reset APNs via Settings → Network & Internet → Mobile Network on Android; on iPhone only Three can change it.
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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 Samsung Galaxy 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.