Xiaomi APN Settings Keep Resetting in Oxford

Xiaomi APN Settings Won't Save? 9 Working Fixes (2026)

If your Xiaomi, Redmi or POCO phone keeps losing APN settings or won't save new APN entries, you're not alone. This is often a software configuration, carrier provisioning, or firmware restriction issue. This UK guide shows you exactly how to fix it on EE, O2, Vodafone, Three and other UK networks.

Quick Answer

In most cases, Xiaomi isn't deleting your APN settings. Instead, the carrier automatically restores its own configuration after the phone reconnects to the mobile network. Start by resetting APN to default, then manually re-enter settings. If the issue persists, reset network settings and check for HyperOS updates.

How to Tell If the Problem Is Caused by the Phone or the Carrier

Before spending time on phone-side fixes, try this quick test:

• Insert your SIM into another phone (any Android or iPhone)
• Manually configure APN settings on that phone
• If APN still resets on the other phone → the issue is likely carrier-related
• If APN stays saved on the other phone → the issue is likely phone-related

What Happens If You Use the Wrong APN?

• No internet – The most obvious sign. Your phone may show 4G/5G but nothing loads.
• MMS won't work – Picture messages fail to send or receive.
• 5G unavailable – Some carriers require specific APN settings for 5G access.
• Slow speeds – You may get a connection, but speeds are unusually slow.
• Authentication failed – The network rejects the connection attempt.

Why APN Settings Keep Resetting on Xiaomi

Understanding why this happens helps you fix it correctly:

Phone-Related Causes

• Carrier configuration auto-update – Some UK carriers automatically push APN settings to your phone. If the carrier push is incorrect or conflicts with your manual settings, it may cause resets.
• HyperOS update bugs – System updates can sometimes cause APN settings to revert to default.
• Carrier or firmware restrictions – Some Xiaomi devices restrict APN editing by default. This is often tied to carrier configuration files or firmware limitations rather than a simple permission toggle.
• Corrupted network configuration – Saved network settings can become corrupted, causing APN settings to fail to save or reset.
• Duplicate APN entries – If multiple APNs exist for the same carrier, the phone may revert to the default carrier APN.
• Carrier configuration and IMS issues – APN settings are tied to carrier provisioning and IMS (IP Multimedia Subsystem) registration. If IMS registration fails or carrier configuration is incomplete, APN changes may not persist.

Carrier-Related Causes

• Automatic carrier configuration – Some UK carriers push APN settings automatically. If the pushed settings don't match what you're trying to save, they may revert.
• SIM card provisioning – Your SIM card may need to be re-provisioned by your carrier.
• Outdated SIM card – Older SIM cards may not support newer APN configurations.

Common Mistakes Users Make When Fixing This

• Not saving the APN after editing – Always tap the save option (usually a checkmark or "Save" button) after editing. Some users miss this step and the APN doesn't stick.
• Not selecting the correct APN after creation – After creating a new APN, you must select it (tap the circle next to it) to make it active.
• Forgetting to restart the phone – APN changes often require a restart to take effect.
• Changing the wrong SIM's APN – If you have two SIMs, make sure you're editing the APN for the SIM you're using for mobile data.

Step-by-Step Fixes

Step 1: Reset APN to Default

Resetting APN to default clears any corrupted or incorrect settings that may be causing the problem.

1. Open Settings
2. Tap SIM cards & mobile networks
3. Tap your carrier's SIM
4. Tap Access Point Names (APN)
5. Tap the menu icon (three dots) and select Reset to default
6. Restart your phone
7. Test if APN settings now stick

Visual Path: Settings → SIM cards & mobile networks → Your SIM → Access Point Names → Reset to default.

Step 2: Manually Create a New APN

If resetting doesn't help, manually create a new APN using your carrier's settings. APN values can change depending on your SIM type and account provisioning. If the default APN doesn't work, check your carrier's latest settings.

1. Go to Access Point Names (APN) in Settings → SIM cards & mobile networks → Your SIM
2. Tap New APN or the + icon
3. Enter your carrier's APN details
4. Tap Save (checkmark or "More" → Save)
5. Select the newly created APN (tap the circle next to it)
6. Restart your phone

Step 3: Reset Network Settings

This resets Wi-Fi, mobile data, and Bluetooth settings without deleting your personal data.

1. Settings → Connection & sharing
2. Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
3. Confirm the reset
4. Restart your phone
5. Reconfigure your APN settings

Step 4: Check for HyperOS Updates

Xiaomi occasionally releases HyperOS updates that include network stability improvements.

1. Settings → About phone → Check for updates
2. Install any available updates
3. Restart your phone and test

Step 5: Disable Wi-Fi Calling Temporarily (Rare Cause)

In some cases, Wi-Fi Calling can interfere with APN saving. This is not a common cause, but it has been reported on some HyperOS builds.

• Settings → SIM cards & mobile networks → Your SIM → Wi-Fi Calling → Toggle OFF
• Try saving APN settings again
• If successful, you can re-enable Wi-Fi Calling afterward

UK Carrier APN Settings Reference

Here are common UK carrier APN settings. Important: APN values can vary depending on your SIM type and carrier provisioning. These are common consumer APN values. Business and MVNO SIMs may use different settings. Always check your carrier's official support page if the default APN does not work.

Carrier	APN	Username	Password
EE	everywhere	Leave blank	Leave blank
O2	mobile.o2.co.uk	mobileweb	password
Vodafone	internet	web	web
Three	three.co.uk	Leave blank	Leave blank
Giffgaff	giffgaff.com	giffgaff	password
Lebara	uk.lebara.mobi	wap	wap

When to Contact Your Carrier

Contact your UK carrier if:

• You've tried all the steps above and APN settings still won't save
• Your carrier has specific APN settings that aren't listed here
• Your SIM card may need to be replaced or re-provisioned
• You're getting authentication errors when trying to connect

Final Verdict

If your Xiaomi APN settings keep resetting, the most common cause is carrier automatic configuration or HyperOS restoring default settings after updates. Start by resetting APN to default and manually re-entering your carrier's settings. Disable Wi-Fi Calling temporarily if APN won't save. If the issue persists, reset network settings and check for HyperOS updates. In most cases, resetting the APN, creating a fresh profile and checking carrier provisioning resolves the issue without requiring hardware repair.

Quick summary:

• APN resets after reboot → Reset APN to default; manually re-enter settings
• APN won't save → Disable Wi-Fi Calling; check for carrier or firmware restrictions
• APN resets after carrier config → Contact your UK carrier
• Still having issues → Reset network settings; update HyperOS

Frequently Asked Questions