Xiaomi Wi-Fi Calling Stops Working After Update in Aberdeen

Xiaomi WiFi Calling Not Working After HyperOS Update? UK Fix (EE, O2, Vodafone)

If WiFi Calling (VoWiFi) stopped working on your Xiaomi, Redmi or POCO phone after a system update, you're not alone. This is often a software-related issue rather than a hardware fault. This UK guide covers the most common fixes for EE, O2, Vodafone, Three and other networks.

Works For

  • ✔ Xiaomi 13 / 14 / 15 series
  • ✔ Xiaomi 11T / 12X
  • ✔ Redmi Note 13 / 14 series
  • ✔ POCO F / X series
  • ✔ HyperOS 1.x
  • ✔ MIUI 12.5 / 13 / 14

About this guide: This guide covers common Xiaomi HyperOS troubleshooting steps and carrier-related checks for UK users.

UK Carrier WiFi Calling – What to Check

WiFi Calling availability depends on several factors:

  • Xiaomi model – Not all models are approved by every carrier
  • Region firmware – Global or EEA ROM is usually required for UK carrier support
  • Carrier approval – Each carrier maintains its own device compatibility list
  • SIM plan – Some older plans may not include WiFi Calling
CarrierNotes
EEAvailability depends on Xiaomi model and firmware
VodafoneCheck supported devices on Vodafone's website
O2Some models require carrier provisioning
ThreeSupport varies by model
MVNOs (Giffgaff, SMARTY, etc.)Depends on host network (O2/Three/Vodafone) and MVNO policy

WiFi Calling Stopped After Update? Quick Fix

  • ✔ Restart your phone – A simple restart often resolves post-update WiFi Calling issues.
  • ✔ Check if the setting has moved – HyperOS updates can relocate WiFi Calling options in Settings.
  • ✔ Try the VoWiFi carrier check code – Dial *#*#869434#*#* in the Phone app to toggle VoWiFi carrier check.
  • ✔ Check for another system update – Some users have reported WiFi Calling problems after HyperOS updates.
  • ✔ Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile & Bluetooth.

Quick Reference – Find Your Fix

ProblemMost Likely CauseFix
WiFi Calling option disappeared after updateHyperOS reset or settings relocationFind new menu path; use engineering code
WiFi Calling greyed out after updateVoLTE disabled or software glitchEnable VoLTE; restart; check for updates
WiFi Calling enabled but not workingNetwork protocol compatibilityUpdate to latest HyperOS build
WiFi Calling works only with VPN offVPN or AdGuard interferenceCheck VPN settings; add IP exceptions

Quick Answer

If WiFi Calling stopped working after a system update, start by restarting your phone—this resolves many post-update glitches. Check if the WiFi Calling setting has moved in Settings, as HyperOS updates can relocate options. Try the engineering code *#*#869434#*#* to toggle the VoWiFi carrier check. If the issue persists, check for another system update—some users have reported WiFi Calling problems after HyperOS updates.

Before You Start

  • Restart your phone first – A simple restart often resolves post-update issues.
  • Check for another system update – Some users have reported WiFi Calling problems after HyperOS updates. Go to Settings → About phone → Check for updates.
  • Check your carrier supports VoWiFi – Contact your UK carrier to confirm they support VoWiFi on your device model.
  • Disable VPN or AdGuard temporarily – VPN apps or network filters may interfere with WiFi Calling setup in some cases.

WiFi Calling Option Missing After HyperOS Update

If the WiFi Calling option has completely disappeared from your Settings menu, try these checks:

  • Search Settings – Open Settings and search for "WiFi Calling" or "VoWiFi". The option may be hidden in a different menu.
  • Check SIM settings – Go to Settings → SIM cards & mobile networks → Your SIM. Look for "Make calls using Wi-Fi".
  • VoLTE dependency – WiFi Calling often requires VoLTE to be enabled. Enable VoLTE first, then check if WiFi Calling appears.
  • Carrier check code – Try dialling *#*#869434#*#* to toggle the carrier check.

After Update: What Changed?

After a HyperOS update, Xiaomi may reset or change:

  • Carrier configuration – The update may reset carrier-specific VoWiFi settings.
  • IMS settings – IMS (IP Multimedia Subsystem) registration may need to be re-established.
  • VoLTE preferences – VoLTE may be disabled or reset after the update.
  • Region-related network settings – Region-specific network settings may be affected.

Check Your Xiaomi Software Version

Before troubleshooting, check your HyperOS version and device details:

  • Settings → About phone
  • Check HyperOS version (e.g., HyperOS 1.0.12.0)
  • Check Android version
  • Note your Xiaomi model number (e.g., Redmi Note 13 Pro 5G Global)

This information can help identify whether your issue is related to a specific HyperOS build or device model.

Why WiFi Calling Stops Working After Updates

Understanding why this happens helps you fix it correctly:

Software-Related Causes

  • HyperOS reset or settings relocation – System updates can reset network settings or move WiFi Calling options to different menus.
  • VoLTE/VoWiFi protocol compatibility – Some HyperOS builds have compatibility differences between network protocols and VoWiFi.
  • VPN or AdGuard interference – VPN apps or network filters may interfere with WiFi Calling setup in some cases.
  • Carrier check re-enabled – Some updates may reset Xiaomi's carrier compatibility check, hiding the VoWiFi option.

Carrier-Related Causes

  • Carrier doesn't support your Xiaomi model – Each UK carrier maintains a list of approved devices. Even if WiFi Calling worked before, the update may have changed how your device interacts with the carrier.
  • Carrier provisioning required – Some carriers need to re-activate VoWiFi on your account after major updates.

Step-by-Step Fixes

Step 1: Restart Your Phone

A simple restart often resolves post-update issues.

  • Restart your Xiaomi phone
  • After reboot, check if WiFi Calling is working again

Step 2: Find the WiFi Calling Setting (It May Have Moved)

HyperOS updates can relocate WiFi Calling options. Try these paths:

  • Settings → SIM cards & mobile networks → Your SIM → Look for "Make calls using Wi-Fi" or "WiFi Calling"
  • Settings → Network & Internet → Mobile network → Your SIM → Advanced → WiFi Calling (on some models)

Step 3: Enable VoLTE (4G Calling) First

VoWiFi often requires VoLTE to be enabled. On many Xiaomi devices, these features are linked. If VoLTE is missing on your Xiaomi.

  • Settings → SIM cards & mobile networks
  • Tap your carrier's SIM
  • Look for "Use VoLTE" or "4G Calling"
  • Ensure it's toggled ON

Step 4: Try the VoWiFi Carrier Check Code

Some updates may re-enable Xiaomi's carrier compatibility check, hiding the VoWiFi option. This code may reveal the WiFi Calling option on some Xiaomi devices by disabling Xiaomi's carrier check.

Important: This code does not add WiFi Calling support. It only removes Xiaomi's carrier check. Your UK carrier must still support VoWiFi on your exact model. Availability depends on region and software version—this code is Xiaomi-specific and may not work on all HyperOS versions.

  1. Open the Phone app
  2. Dial *#*#869434#*#* (VoWiFi carrier check disable)
  3. You should see a message: "VoWiFi carrier check was disabled" or "VoWiFi carrier was disabled"
  4. Restart your phone
  5. Check the WiFi Calling option again

Step 5: Check for Another System Update

Some users have reported WiFi Calling problems after HyperOS updates. The solution is often a newer system update with improved switching logic.

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

Step 6: Disable VPN or AdGuard Temporarily

VPN apps or network filters may interfere with WiFi Calling setup in some cases, particularly on EE and its MVNOs.

  • Turn off your VPN or AdGuard temporarily
  • Disable and re-enable WiFi
  • Check if WiFi Calling activates
  • If it works, you may need to add IP exceptions for your VPN or ad-blocker

Step 7: Reset Network Settings

If other steps don't help, resetting network settings can clear any corrupted data from the update.

  1. Settings → Connection & sharing
  2. Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
  3. Confirm the reset
  4. Restart your phone
  5. Re-enable WiFi Calling using the steps above

UK Carrier-Specific Notes

If you're on an EE MVNO like Mozillion, some users have reported WiFi Calling issues related to VPN or AdGuard blocking required IP ranges.

Vodafone UK provides specific device guides for enabling WiFi Calling on Xiaomi devices. The setting is typically found under Settings → SIM cards & mobile networks → Your SIM → "Make calls using Wi-Fi".

What to Do If WiFi Calling Still Doesn't Work

If WiFi Calling is still not working after completing all steps:

  • Test in an area with poor cellular coverage – WiFi Calling activates when cellular signal is weak
  • Test with another VoWiFi-enabled device – This helps identify if the issue is with your phone or your carrier
  • Submit feedback via Xiaomi's Services & Feedback app – Settings → Services & feedback

Contact Xiaomi UK Support

If WiFi Calling still doesn't work after completing all steps, contact Xiaomi UK Support:

  • Xiaomi UK Support website – Official support portal for UK customers
  • Feedback app – Settings → Services & feedback
  • Xiaomi Community – Post in official Xiaomi community forums, including UK-specific threads

Final Verdict

If your Xiaomi WiFi Calling stopped working after a system update, the most common fixes are restarting your phone, finding the relocated setting, and using the engineering code *#*#869434#*#*. Check for another system update, as some users have reported WiFi Calling problems after HyperOS updates. If you use a VPN or AdGuard, try disabling it temporarily. If the issue persists, reset network settings or contact your UK carrier.

Quick summary:

  • Option disappeared after update → Restart; find relocated setting; use engineering code
  • Option greyed out → Enable VoLTE; restart; check for updates
  • Not working after enabling → Check for another system update; disable VPN/AdGuard
  • Still not working → Reset network settings; contact carrier

Frequently Asked Questions

Why did WiFi Calling disappear after HyperOS update?

HyperOS updates can reset network settings or relocate WiFi Calling options to different menus. Try restarting your phone and using the engineering code *#*#869434#*#*.

Why does WiFi Calling stop after reboot?

This can happen if the VoWiFi carrier check is re-enabled after reboot. Try the engineering code *#*#869434#*#* and restart your phone.

Why does Xiaomi WiFi Calling work before update but not after?

Some users have reported WiFi Calling problems after HyperOS updates. Check for another system update or try the engineering code to toggle the VoWiFi carrier check.

Can I downgrade HyperOS to restore WiFi Calling?

Downgrading is possible but not recommended for most users. It carries risks of data loss and boot loops. It's better to wait for a newer update or use the fixes above.

Can a VPN stop WiFi Calling on Xiaomi?

VPN apps or network filters may interfere with WiFi Calling setup in some cases, particularly on EE and its MVNOs.

Do these fixes work on UK Xiaomi devices?

Most steps are similar across Xiaomi, Redmi and POCO devices, but menu names may vary depending on your HyperOS or MIUI version.

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