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Three APN Settings iPhone

📅 Last updated: 17 May 2026

Three APN Settings iPhone guide with steps, settings, troubleshooting, FAQs and related UK mobile network fixes.

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Three APN Settings iPhone | UK Mobile Guide — UK APN Hub guide Three APN Settings iPhone

Where to find APN settings on iPhone

Publishing order: 458 • Cluster 40: Device and Network SEO

If your internet connection is slow or mobile data is not working properly, this Three APN Settings iPhone | UK Mobile Guide guide will help you configure everything correctly.

Use this guide to fix setup problems, mobile data issues, signal problems and UK mobile network settings with clear steps and related guides.

If your phone shows no service, slow mobile internet, hotspot issues, a blocked SIM, roaming failure or an APN problem, start with the steps below before changing advanced settings.

Restart your phone and wait for the mobile network to reconnect.

Check that your SIM settings, cellular data and roaming settings are correct for your plan.

Open mobile internet settings and confirm the APN configuration has not been removed or saved incorrectly.

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Troubleshooting — Try Steps in This Exact Order STEP 1 Toggle Aeroplane Mode STEP 2 Full Restart your phone STEP 3 Delete & re-enter APN from scratch STEP 4 Reset Network Settings ⚠ STEP 5 Contact Network Support ⚠ Step 4 (Reset Network Settings) will delete: • All saved Wi-Fi passwords • All Bluetooth pairings and VPN configurations Note your Wi-Fi passwords before using this step. 💡 Most issues are caused by: • Wrong APN text (one typo stops everything) • APN saved but not selected (no filled circle) • Phone not restarted / aeroplane mode not toggled

Follow these steps in order — most issues are resolved by step 1 or 2

Entering Three APN values on iPhone

Setting Value
APN Name3internet
Username(leave blank)
Password(leave blank)
MMSChttp://mms.um.three.co.uk:10021/mmsc
MMS Proxy193.113.200.195
MMS Port8799
Authentication TypeNone
APN Typedefault,supl,mms

Open your phone settings, select Mobile Network or Cellular Data, then review the APN profile. Save the settings, restart your device and test browsing, picture messages and hotspot if your plan supports it.

Internal guides to check next

For stronger results, follow the network hub first, then continue through APN, MMS, eSIM, roaming and fix guides. This structure helps users and search engines understand the full topic clearly.

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Frequently Asked 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.