Xiaomi VoWiFi Not Working in Coventry

Xiaomi VoWiFi Not Working in Coventry (2026 Fix)

If your Xiaomi, Redmi or POCO phone has no VoWiFi option, WiFi Calling greyed out, or calls not routing over WiFi while you're in Coventry, this guide covers the most common fixes. As UK mobile networks continue retiring 3G services, reliable VoLTE and WiFi Calling support is becoming increasingly important. This issue can affect both physical SIMs and eSIMs across all UK carriers.

Important

VoWiFi requires both carrier support and a compatible device. Unlike VoLTE, WiFi Calling depends heavily on your carrier's specific device approval list. A missing or greyed out VoWiFi toggle does not always mean your phone is faulty.

Before You Start – Quick Checks

  • Check your carrier supports VoWiFi – Not all plans or MVNOs include WiFi Calling. Check your carrier's website or app.
  • Connect to a stable WiFi network – VoWiFi requires a working internet connection. Test with a different WiFi network if possible.
  • Restart your phone – Clears temporary software glitches affecting IMS registration.
  • Test with Airplane Mode + WiFi only – Turn on Airplane Mode, enable WiFi, and try making a call. If the call connects, VoWiFi is working.
  • Check your data plan – Some pay-as-you-go plans or older contracts may not include WiFi Calling.

If these quick checks don't work, continue with the step-by-step guide below.

Quick Navigation

Diagnose the Issue First

Before making changes, determine which problem you actually have:

Three Possible Scenarios

  • A. VoWiFi toggle is completely missing – The option does not appear in Settings. This is usually carrier support, firmware, or device compatibility.
  • B. VoWiFi toggle exists but is greyed out – The switch is visible but cannot be turned on. This often indicates carrier provisioning or account issues.
  • C. VoWiFi toggle is on but calls don't route over WiFi – The toggle is enabled but calls still use the mobile network. Check WiFi stability and IMS registration.

Key diagnostic questions:

  • Is the toggle missing, greyed out, or on but not working?
  • Does the same SIM support VoWiFi in another phone?
  • Does another carrier SIM show VoWiFi on this Xiaomi?
  • Did the problem start after a system update?
  • Are you on a PAYG plan? Some carriers only support VoWiFi on Pay Monthly plans.
  • Does VoWiFi work on a different WiFi network (e.g., mobile hotspot, work WiFi)? If yes, the issue is likely with your home network configuration rather than your phone or carrier.

Why VoWiFi Is Not Working

  • Carrier does not support VoWiFi on your model – Carriers maintain device approval lists. If your Xiaomi model is not on the list, VoWiFi won't work even if the toggle appears.
  • Carrier provisioning failure – Your carrier has not enabled WiFi Calling on your account or SIM profile.
  • VoLTE/IMS dependency – On some Xiaomi and carrier configurations, VoLTE and WiFi Calling provisioning are closely linked. If VoLTE is unavailable, it is worth checking whether IMS/VoLTE support is correctly provisioned before troubleshooting WiFi Calling further.
  • HyperOS update reset – Major updates can hide or grey out VoWiFi toggles for certain carriers.
  • Regional firmware mismatch – Chinese ROM devices may lack UK carrier VoWiFi bundles. Global or EEA ROM is recommended for full carrier support.
  • Pay As You Go plan restriction – Some carriers only support VoWiFi on Pay Monthly plans.
  • WiFi network issue – Some public or corporate WiFi networks block VoWiFi traffic. Captive portal networks (hotels, airports) may not work. Home router settings (firewall, port blocking, VPN, or ISP restrictions) can also interfere.

Check Carrier VoWiFi Support

Before troubleshooting your device, verify your carrier's VoWiFi support using this matrix:

UK Carrier VoWiFi Compatibility Check

What to verify Why it matters How to check
Does your exact Xiaomi model support WiFi Calling on your carrier? Carrier device approval may be model-specific. Not all Xiaomi models are supported by all carriers. Check your carrier's website or contact support with your exact model number (e.g., Xiaomi 14, Redmi Note 13 Pro).
Is WiFi Calling included with your plan? Some plans, MVNOs, and PAYG options may not include WiFi Calling. Check your plan details in your carrier's app or contact support.
Does the same SIM work in another supported phone? This separates SIM/account issues from Xiaomi compatibility. Insert your SIM into a phone known to support WiFi Calling on your carrier and test.
Does another supported SIM work in this Xiaomi? Helps isolate carrier vs device issues. Test a different carrier SIM in your Xiaomi. If VoWiFi appears, the issue is carrier-specific.

Carrier support does not guarantee VoWiFi compatibility with every Xiaomi model or imported firmware version.

Carrier-Specific Notes

  • EE – Check the EE app for "WiFi Calling" settings or call 150.
  • O2 – On some O2-compatible devices, activation may involve carrier-specific setup. Check O2's current instructions for your plan and device.
  • Vodafone – Check the Vodafone app for "WiFi Calling" or call 191.
  • Three UK – Check the Three app for VoWiFi settings or call 333.
  • MVNOs – Support varies by provider. Check your specific provider's support page.

Coventry Network Notes

  • Location-based diagnosis – If WiFi Calling fails only at home in Coventry but works on another WiFi network, the problem is unlikely to be city-wide mobile coverage. Compare your home broadband connection with another WiFi network, disable any VPN temporarily, and check your router configuration.
  • Network troubleshooting – For home WiFi issues, try: restarting your router, disabling VPN or custom DNS, disabling parental controls or security filtering temporarily, and testing with a mobile hotspot to isolate your home network.

Step-by-Step Fixes

Step 1: Test Whether VoWiFi Already Works

Why this matters: Before troubleshooting the toggle, check if VoWiFi is already active. A missing toggle does not always mean VoWiFi is unavailable.

  • Turn on Airplane Mode
  • Enable WiFi and connect to a network
  • Make a call to any number
  • If the call connects, VoWiFi is working – the toggle may simply be hidden or the icon may not display
  • If the call fails or prompts you to disable Airplane Mode, VoWiFi is not working

Note: This is one of the clearest practical ways to test whether calls can route through WiFi independently of the mobile network. Some Xiaomi models don't display the VoWiFi icon even when the feature is active.

If the call does not connect in Airplane Mode, move to Step 2.

Step 2: Test on a Different WiFi Network

Why this matters: If WiFi Calling fails on your home WiFi but works on another network, the issue is likely with your network configuration, router, or ISP rather than your phone or carrier.

  • Connect to a different WiFi network (mobile hotspot, work, public WiFi, friend's home)
  • Test VoWiFi in Airplane Mode on that network
  • If VoWiFi works elsewhere, investigate your home network: check VPNs, firewall settings, and router configuration
  • If VoWiFi fails on multiple WiFi networks, proceed with device and carrier troubleshooting

If VoWiFi works reliably on another WiFi network, your phone and carrier provisioning are less likely to be the cause. Focus first on differences in the failing network, such as VPN use, firewall rules, router configuration, or ISP-related restrictions.

If VoWiFi fails on multiple networks, move to Step 3.

Step 3: Try Xiaomi's VoWiFi Carrier Check Code

Why this matters: On some Xiaomi devices, this code can change carrier-check behaviour and make the VoWiFi option visible. It does not guarantee that your carrier will provision VoWiFi.

  1. Open the Phone app
  2. Dial exactly: *#*#869434#*#*
  3. You may see a confirmation message: "VoWiFi carrier check was disabled" or similar – this may vary by device and HyperOS version
  4. Restart your phone
  5. Check VoWiFi toggle: Settings → SIM cards & mobile networks → Tap your SIM → VoWiFi toggle may now appear

Important: If the code makes the VoWiFi option appear but the control remains unavailable, the issue is likely carrier provisioning or device compatibility – proceed to Step 4.

If the toggle is still missing or greyed out, move to Step 4.

Step 4: Verify VoLTE and IMS Registration

Why this matters: On some Xiaomi and carrier configurations, VoLTE and WiFi Calling provisioning are closely linked. If VoLTE is unavailable, it is worth checking whether IMS/VoLTE support is correctly provisioned before troubleshooting WiFi Calling further.

  • Settings → SIM cards & mobile networks
  • Tap your SIM
  • Look for "Use VoLTE" or "4G Calling"
  • Ensure it is toggled ON
  • If VoLTE is missing, try dialling *#*#86583#*#* to enable carrier check for VoLTE
  • Check IMS registration as a diagnostic clue:
    • Dial *#*#4636#*#*
    • Tap Phone information
    • Look for "IMS registered" – if true, your phone is connected to your carrier's IMS servers
  • If IMS shows "Not Registered", this can indicate that VoLTE/IMS provisioning is incomplete. However, the diagnostic menu does not expose the same information on every Xiaomi or HyperOS version, so a missing or unavailable IMS field should not be treated as proof of a hardware fault.

Note: Depending on your Xiaomi model and HyperOS version, some IMS fields may not be available in this menu.

If IMS is not registered, move to Step 5.

Step 5: Check Carrier VoWiFi Provisioning and Compatibility

Why this matters: Carriers do not automatically enable VoWiFi on all plans or SIMs. Some require specific activation steps.

For O2 customers: On some O2-compatible devices, activation may involve carrier-specific setup or app-based configuration. Check O2's current instructions for your plan and device.

For other carriers: Contact your carrier to verify VoWiFi is enabled on your account:

  • EE – Check the EE app for "WiFi Calling" settings or call 150
  • Vodafone – Check the Vodafone app for "WiFi Calling" or call 191
  • Three UK – Check the Three app for VoWiFi settings or call 333
  • MVNOs – Contact your specific provider's support channel

Device compatibility: If your carrier confirms VoWiFi is enabled on your account but the toggle is still missing, your specific Xiaomi model may not be on your carrier's approved device list. Some carriers only support VoWiFi on specific models.

PAYG plans: If you're on a Pay As You Go plan, note that some carriers only support VoWiFi on Pay Monthly plans.

If provisioning is confirmed but the toggle is still missing, move to Step 6.

Step 6: Reset Network Settings

Why this matters: This resets Wi-Fi, mobile data, and Bluetooth settings without deleting personal data. It clears corrupted network configurations that may be blocking IMS registration.

  1. Settings → Connection & sharing (HyperOS) or Settings → Additional settings → Backup & reset (MIUI)
  2. Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
  3. Confirm the reset
  4. Restart your phone
  5. Reconnect to your WiFi network and test VoWiFi in Airplane Mode

Note: Resetting network settings will clear saved Wi-Fi passwords and Bluetooth devices, but will not delete photos or personal data.

If resetting network settings doesn't work, move to Step 7.

Step 7: Check for HyperOS Updates

Why this matters: Software updates can include network, modem, or stability improvements that affect VoWiFi support.

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

If you're already on the latest version and VoWiFi is still unavailable, contact your carrier or Xiaomi support.

Contact Carrier (When Required)

Contact your carrier if:

  • VoWiFi provisioning is missing on your account or plan
  • You've tried all steps above and VoWiFi is still not working
  • You're on a PAYG plan and VoWiFi may not yet be available
  • There's a known network issue in Coventry
  • You need to check if your specific Xiaomi model is approved for VoWiFi on their network

Carrier Support Contacts

Contact Xiaomi UK Support if:

  • You've tried all steps above and VoWiFi is still unavailable
  • VoWiFi works with other carrier SIMs but not yours on this device
  • The device uses UK/Global firmware but does not expose VoWiFi correctly
  • The problem started after a specific HyperOS update and persists across networks
  • Another identical compatible Xiaomi device behaves differently with the same SIM

Xiaomi UK Support

Final Verdict – Diagnostic Decision Tree

Use this decision tree to determine the most likely cause and next action:

  • Toggle is completely missing → Try the carrier-check code (*#*#869434#*#*). If still missing, check carrier compatibility and device firmware. Consider that your carrier may not support VoWiFi on your specific Xiaomi model.
  • Toggle is greyed out → Check carrier provisioning first, then verify carrier compatibility and device firmware behaviour. Contact your carrier to enable WiFi Calling on your account.
  • Toggle is on but calls don't route over WiFi → Test on a different WiFi network first. If it works elsewhere, the issue is your home network. If it fails on multiple networks, check IMS registration and carrier provisioning.
  • Airplane Mode + WiFi call works → VoWiFi is active despite the missing toggle or icon. No further action needed.
  • Airplane Mode + WiFi call fails → VoWiFi is not working. Continue with carrier provisioning and IMS checks.
  • VoWiFi works on another WiFi network → The issue is with your home network, not your phone or carrier. Check VPN, firewall, and router settings.
  • VoWiFi fails on multiple WiFi networks → Focus on device and carrier troubleshooting.

Frequently Asked Questions

Why is my VoWiFi option missing on Xiaomi in Coventry?

Common causes include carrier not supporting VoWiFi on your specific Xiaomi model, carrier provisioning not enabled on your account, Pay As You Go plan restrictions, HyperOS updates hiding toggles, or regional firmware mismatch.

Does the code *#*#869434#*#* work on all Xiaomi phones?

It works on many but not all devices or HyperOS versions. If nothing happens when you dial the code, your device may not support it. Appearance of the toggle does not guarantee VoWiFi will work.

Why does VoWiFi work on other networks but not on my carrier?

Carriers maintain different device approval lists. Your Xiaomi model may be supported on EE but not on O2, for example. Check with your carrier if your specific device is approved for VoWiFi.

How do I know if VoWiFi is actually working without the icon?

Turn on Airplane Mode, enable WiFi only, and try making a call. If the call connects, VoWiFi is working.

Can a VPN, firewall, or home router block VoWiFi?

Yes. Some VPNs, firewalls, or network configurations may block the ports or protocols used by VoWiFi. Try disconnecting any VPN and test on a different WiFi network. If WiFi Calling works elsewhere, investigate your home network configuration rather than resetting the phone repeatedly.

Does ROM version affect VoWiFi support?

Yes. Chinese ROM versions may have limited VoWiFi support on UK carriers. Global ROM (MI) or EEA (EU) ROM is recommended for UK carrier support.

Why did VoWiFi disappear after a HyperOS update?

HyperOS updates can sometimes re-enable carrier checks or reset network settings. Try dialling the hidden code *#*#869434#*#* and restarting your phone.

Is VoWiFi essential for voice calls?

As 3G services are retired, VoLTE is becoming increasingly important for mobile voice calls, while WiFi Calling can provide an alternative when indoor mobile coverage is weak.

Note: This guide is updated for 2026. Menu names may vary slightly between HyperOS and MIUI versions. As UK networks continue retiring 3G services, VoLTE and WiFi Calling support varies by carrier and plan.

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