Xiaomi Mobile Data Not Working on UK Networks After HyperOS Update

Xiaomi Mobile Data Not Working on UK Networks After HyperOS Update – UK Fix

This guide helps if your Xiaomi lost mobile data after a HyperOS update. You may have 4G or 5G signal but no internet, or no signal at all after restarting following a system update. If you've searched for "Xiaomi mobile data not working after HyperOS update", "Redmi mobile internet stopped working", "HyperOS update broke mobile data", or "POCO no internet after update", this guide will help.

Quick Answer:
If your mobile data stopped working after a HyperOS update, first check your Access Point Name (APN) settings – updates can occasionally reset APN configuration. Go to Settings → SIM cards & mobile networks → [Your carrier] SIM → Access Point Names → three dots → Reset to default → Restart. Also check that Mobile data is ON, Data Saver is OFF, and Preferred network type is set to 5G/4G/3G auto.

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS on UK networks: EE, O2, Vodafone, Three, Giffgaff, SMARTY, VOXI, Lyca, Lebara, and others.

Before Changing Settings

After a HyperOS update, try these quick checks before diving into settings:

  • Restart your phone once more – A second reboot can sometimes resolve registration issues.
  • Wait 15–30 minutes – Carrier settings may take time to refresh after a major update.
  • Toggle Airplane mode – ON for 30 seconds, then OFF. This forces a fresh network connection.
  • Check whether calls and SMS work normally – If calls work but data doesn't, the issue is APN or data-specific. If calls also fail, the issue is network registration.

🔍 Quick Start – Find Your Path

SymptomMost Likely CauseGo To
4G/5G icon shows but no internetAPN settings resetSection 1
No 4G/5G icon at allNetwork mode or signal issueSection 2
Signal present but unstableHyperOS battery or network switchingSection 3
Data works on WiFi but not on mobileAPN or carrier restrictionSection 4
Only some apps work, others don'tData Saver or permissionsSection 5

Section 1 – 4G/5G Icon Shows but No Internet (Most Common)

If you see 4G or 5G signal bars but apps won't load, your phone can see the network but cannot route data. APN settings are one of the first things to check after a HyperOS update because they can occasionally be reset or modified.

Try these in order:

  1. Reset APN to default – Settings → SIM cards & mobile networks → [Your carrier] SIM → Access Point Names → three dots → Reset to default → Restart.
  2. Check your APN is selected – After reset, go back to APN settings and ensure the dot is next to your carrier's APN. If not, tap to select it.
  3. Check your carrier's APN manually – Some carriers require specific APN settings. If reset doesn't work, check your carrier's website and enter the values manually.
  4. Toggle Airplane mode – ON for 30 seconds, then OFF. This forces your phone to reconnect to the network.

Section 2 – No 4G/5G Icon at All

If your phone shows no signal after a HyperOS update, the update may have changed your preferred network type or network registration. This is a common issue if you've experienced "Xiaomi mobile data not working after update".

Try these in order:

  1. Check preferred network type – Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → Select 5G/4G/3G auto (not "5G only" or "3G only").
  2. Manual network selection – Settings → SIM cards & mobile networks → [Your carrier] SIM → Network operators → Turn off "Choose automatically" → Search → Select your carrier manually.
  3. Restart your phone – A second reboot after the update can sometimes restore network registration.
  4. Check SIM card – Power off → remove SIM → clean contacts → reinsert firmly → restart.
  5. Check IMEI – Dial *#06# to display your IMEI number. If it shows "Unknown" or "Null", the update may have affected the phone's modem or network configuration. Contact Xiaomi support or a qualified repair technician.

Check Whether Mobile Data Is Enabled

After a HyperOS update, Mobile Data can sometimes be toggled off. This is a simple but frequently overlooked cause.

  1. Check Mobile Data toggle – Settings → SIM cards & mobile networks → [Your carrier] SIM → Mobile data → ON.
  2. Check Dual SIM settings – If using Dual SIM, verify the correct SIM is selected for mobile data.
  3. Test with a different SIM – If possible, test a different SIM in your Xiaomi to isolate the issue.

Section 3 – Signal Present but Unstable After Update

If you have signal but it keeps dropping or is unstable after a HyperOS update, the issue is often power management or network switching.

Try these in order:

  1. Turn off Battery Saver – Settings → Battery → Battery saver → OFF.
  2. Turn off Data Saver – Settings → SIM cards & mobile networks → [Your carrier] SIM → Data saver → OFF.
  3. Disable "Clear cache when device is locked" – Settings → Battery → Additional features → Clear cache when device is locked → OFF.
  4. Switch to 4G – Set Preferred network type to 4G/3G/2G auto to improve stability.

Section 4 – Data Works on WiFi but Not on Mobile

If internet works on WiFi but mobile data doesn't, the issue is APN or carrier restriction. This is a common symptom of "Redmi internet not working after update".

Try these in order:

  1. Reset APN to default – Section 1.
  2. Check data allowance – Open your carrier's app. If you've exceeded your allowance, data may be blocked.
  3. Check carrier restrictions – Some MVNOs or plans block mobile data under certain conditions. Contact your carrier.

Section 5 – Only Some Apps Work, Others Don't

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

Try these in order:

  1. Turn off Data Saver – Settings → SIM cards & mobile networks → [Your carrier] SIM → Data saver → OFF.
  2. Check per-app data permissions – Settings → Apps → Manage apps → Select app → Data usage → Background data → Allow.
  3. Check app battery restrictions – Settings → Apps → Manage apps → Select app → Battery saver → Set to "No restrictions".

🔍 Quick Diagnostic Table

TestResult
Calls work but internet doesn'tAPN or data issue
Calls and internet both failNetwork registration issue
WiFi works but mobile data doesn'tAPN or carrier issue
SIM works in another phoneXiaomi settings issue
Different SIM also failsPhone configuration issue

Why Does HyperOS Update Affect Mobile Data?

  • APN settings reset – Updates can occasionally clear or change APN values.
  • Network mode changes – Preferred network type may reset to "5G only" or "3G only".
  • Battery optimisations enabled – HyperOS may re-enable Data Saver or Battery Saver.
  • Carrier profile refresh – Updates may include new carrier settings that take time to apply.
  • Network registration glitch – The phone may not re-register on the network after reboot.
  • IMS registration refresh – The IMS (IP Multimedia Subsystem) registration may need to be refreshed after a major update – this is how your phone connects to voice and data services.
  • VoLTE configuration changes – VoLTE (Voice over LTE) settings may be reset, affecting data and call stability.

⚠️ What NOT to Do

  • Don't factory reset your phone – This is rarely necessary after an update.
  • Don't assume your SIM is faulty – Test your SIM in another phone first.
  • Don't ignore APN settings – This is one of the first things to check after a HyperOS update.

Quick Questions

Why did my mobile data stop working after HyperOS update?
Most commonly, APN settings were reset during the update. Reset APN to default and restart.

Why did mobile data stop working immediately after the update finished?
During major HyperOS updates, carrier settings, APN profiles, and network registration information may be refreshed. In some cases the phone reconnects automatically, while in others a manual APN reset or network refresh is required.

How do I fix mobile data after HyperOS update?
1. Reset APN
2. Check preferred network type
3. Turn off Battery Saver
4. Restart your phone

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

Do I need to reset APN for every update?
Not always, but many HyperOS updates can reset APN settings. Check APN after each major update.

Why does my data work on WiFi but not mobile after update?
APN settings are the most likely cause. Reset APN to default and restart.

How do I check my IMEI number?
Dial *#06# to display your IMEI. If it shows "Unknown" or "Null", the update may have affected the phone's modem or network configuration – contact Xiaomi support.

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