Finding the APN screen on iPhone — Three APN Settings iPhone — Quick Guide
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If your internet connection is slow or mobile data is not working properly, this Three APN Settings iPhone | UK Mobile guide will help you configure everything correctly.
For Three setup problems, weak signal or data faults.
Whether it's no signal, sluggish data, hotspot problems or an APN error on Three, start with the basics.
After rebooting, don't test until re-registration has finished.
Check the SIM status alongside your data and roaming toggles against what your tariff covers.
Mobile internet settings are worth checking to rule out a missing or incorrect APN.
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Troubleshooting checklist
Most people on Three are back online early in this list
Step 1Check APNStep 2Select APNStep 3Toggle flight modeStep 4Restart phoneStep 5Test data
Entering Three APN values on iPhone — Three APN Settings iPhone — Quick Guide
| 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 |
Open Mobile Network or Cellular Data, review the Three APN, save, reboot, then test browsing, MMS and hotspot.
Internal guides to check next
Frequently Asked Questions About Three APN Settings iPhone — Quick Guide
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.