Xiaomi Mobile Data Connected But Not Working on Three UK

Xiaomi Mobile Data Connected But Not Working on Three UK – UK Fix

This guide helps if your Xiaomi on Three UK shows a 4G or 5G signal icon but apps and websites won't load, or mobile data is connected but internet doesn't work. If you've searched for "Xiaomi no internet on Three", "Three mobile data not working Xiaomi", or "Xiaomi 4G connected but no internet", this guide covers the most common fixes.

Quick Answer:
If your Xiaomi shows 4G/5G signal on Three UK but no internet, first toggle Airplane mode ON for 30 seconds, then OFF. Then check your data allowance in the Three app or online account. Then go to Settings → SIM cards & mobile networks → Three SIM → Access Point Names → Reset to default. For most modern Three SIMs, the APN is three.co.uk (some older SIMs, business accounts, or legacy configurations may still use 3internet).

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS on the Three UK network, including MVNOs like SMARTY and iD Mobile.

🔍 Quick Check – Signal vs Data

What you seeWhat it usually means
4G/5G signal but no internetAPN, data allowance, or network issue
Signal appears and disappearsCoverage or network switching
Internet works on WiFi but not mobileAPN or carrier restriction
Some apps work, others don'tData Saver or permissions

🔍 Quick Start – Find Your Path

SymptomMost Likely CauseGo To
4G/5G signal shows but no internetAPN or data allowanceSection 1
Signal appears and disappearsCoverage or network issueSection 2
Data works on WiFi but not mobileAPN or carrier restrictionSection 3
Some apps work, others don'tData Saver or permissionsSection 4
Error started after HyperOS updateSettings resetSection 5

Section 1 – 4G/5G Signal Shows but No Internet

If you see 4G or 5G signal bars but apps won't load, your phone can see the Three network but cannot route data. This is often an APN or data allowance issue.

Try these in order:

  1. Toggle Airplane mode – ON for 30 seconds, then OFF. This forces reconnection.
  2. Open a website in your browser – If apps don't work, try visiting a website such as example.com. If websites also fail to load, the issue is likely with your mobile data connection rather than a specific app.
  3. Check your data allowance – Open the Three app or check your online account. If you've exceeded your allowance, data may be blocked.
  4. Reset APN to default – Settings → SIM cards & mobile networks → Three SIM → Access Point Names → three dots → Reset to default → Restart.
  5. Check APN manually – For most modern Three SIMs, the correct APN is three.co.uk. Some older SIMs, business accounts, or legacy configurations may still use 3internet. If your APN is incorrect, edit it or create a new one.
  6. Check preferred network type – Settings → SIM cards & mobile networks → Three SIM → Preferred network type → Select 5G/4G/3G auto (not "5G only" or "3G only").
  7. Check Three network status – Visit Three's network status page for your postcode. If there's an outage, wait 2-4 hours.
  8. Restart your phone – A full reboot can resolve temporary glitches.
  9. Test your SIM in another phone – If data works there, the issue is your Xiaomi. If not, contact Three.

Section 2 – Signal Appears and Disappears (Coverage or Network Issue)

If signal appears and disappears, the issue is usually coverage or network switching.

Try these in order:

  1. Check Three coverage – Visit Three's coverage map for your postcode. If coverage is weak, this is expected.
  2. Switch to 4G – Set Preferred network type to 4G/3G/2G auto. 5G can be unstable in some areas.
  3. Toggle Airplane mode – ON for 30 seconds, then OFF. This forces reconnection.
  4. Check for mast maintenance – Contact Three to ask if there are known issues in your area.

Section 3 – Data Works on WiFi but Not Mobile

If internet works on WiFi but mobile data doesn't, the issue is APN or carrier restriction.

Try these in order:

  1. Reset APN to default – Section 1.
  2. Check data allowance – Open the Three app or online account. If you've exceeded your allowance, data may be blocked.
  3. Check carrier restrictions – Common restrictions include data cap reached, spend cap, roaming restrictions, or account suspension. Contact Three to check.

Section 4 – Some Apps Work, Others Don't

If some apps (like WhatsApp) work but others (like Chrome) don't, Data Saver, app permissions, or restricted data usage are likely the issue.

Try these in order:

  1. Turn off Data Saver – Settings → SIM cards & mobile networks → Three SIM → Data saver → OFF.
  2. Check per-app data permissions – Settings → Apps → Manage apps → Select app → Data usage → Background data → Allow.
  3. Check Restricted Data Usage – Settings → Apps → App info → Mobile data & Wi-Fi → Ensure the app is allowed to use mobile data.
  4. Check app battery restrictions – Settings → Apps → Manage apps → Select app → Battery saver → Set to "No restrictions".
  5. Disable any VPN or ad-blocking app temporarily – Apps like AdGuard, RethinkDNS, or Blokada can sometimes block mobile data.

Section 5 – Error Started After HyperOS Update

If mobile data stopped working after a HyperOS update, the update may have reset APN or network settings.

Try these in order:

  1. Check APN – Reset to default or manually set to three.co.uk.
  2. Check preferred network type – Set to 5G/4G/3G auto.
  3. Check Private DNS – Settings → Connection & sharing → Private DNS → Turn OFF temporarily for testing, then re-enable it afterwards if it wasn't the cause.
  4. Clear Carrier Services cache (if installed) – Settings → Apps → Manage apps → Carrier Services → Storage → Clear cache.
  5. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth (removes saved Wi-Fi passwords).
  6. Reboot twice – Some updates require a second reboot to fully apply changes.

Dual SIM Considerations

If you're using two SIMs, try these steps:

  • Disable the second SIM temporarily – Settings → SIM cards & mobile networks → Turn off the second SIM.
  • Set Three as default for Mobile Data – Settings → SIM cards & mobile networks → Default for mobile data → Select Three.
  • Restart your phone – After making changes, restart to apply them.

eSIM Considerations

If you're using an eSIM on Three:

  • Check if the eSIM profile has expired – Some eSIMs have a limited validity period.
  • Contact Three – Ask them to refresh the eSIM profile or send a new QR code.
  • Delete and re-download the carrier profile – Only if Three recommends this.

Why Is Mobile Data Connected But Not Working on Three?

  • APN misconfiguration – Incorrect APN settings prevent data routing.
  • Data allowance exceeded – Your data may be blocked.
  • Network congestion – Too many users on the same mast.
  • Coverage issue – Weak signal in your area.
  • Incorrect Private DNS configuration – Can prevent internet access.
  • VPN or ad-blocker interference – Some VPNs or ad-blockers can block mobile data.
  • Settings reset – After updates, APN or network preferences may change.
  • Carrier issue – Temporary Three network problem.

⚠️ What NOT to Do

  • Don't factory reset your phone – This is rarely needed.
  • Don't assume your phone is broken – Test your SIM in another phone first.
  • Don't ignore your data allowance – Check before troubleshooting.

Quick Questions

Why does my Xiaomi show 4G/5G but no internet on Three?
Most commonly APN settings are incorrect, or you've exceeded your data allowance. Reset APN to default and check your allowance.

What is the correct APN for Three UK on Xiaomi?
For most modern Three SIMs, the APN is three.co.uk. Some older SIMs, business accounts, or legacy configurations may use 3internet. Reset APN to default or try both.

Why do only some apps work on mobile data?
This is usually Data Saver, Restricted Data Usage, or app permissions. Check Section 4.

Can VPN cause mobile data to stop working?
Yes. Some VPNs and ad-blocking apps like AdGuard, RethinkDNS, or Blokada can interfere with mobile data. Try disabling them temporarily.

How do I reset APN on Xiaomi?
Settings → SIM cards & mobile networks → Three SIM → Access Point Names → three dots → Reset to default.

Will resetting network settings delete my photos?
No. Only saved Wi-Fi passwords and Bluetooth devices are removed.

Why does my Xiaomi have signal but no internet after HyperOS update?
The update may have reset APN, preferred network type, or DNS settings. Check all three in Section 5.

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