Xiaomi Wi-Fi Calling Missing in Norwich

Xiaomi WiFi Calling Missing? – UK Fix (2026)

If WiFi Calling (VoWiFi) is missing on your Xiaomi, Redmi or POCO phone, the problem is usually related to carrier compatibility, firmware settings, or network configuration. This UK guide explains the most common fixes for EE, O2, Vodafone, Three and other networks.

Works For

  • ✔ Xiaomi 14 / 15 series
  • ✔ Redmi Note 13 / 14 series
  • ✔ POCO F series
  • ✔ POCO X series
  • ✔ HyperOS
  • ✔ MIUI 12.5 / 13 / 14

About this guide: This guide combines official Xiaomi UK support information with carrier-specific requirements for EE, O2, Vodafone, Three, and their MVNOs.

WiFi Calling Missing? Quick Fix

  • ✔ Check carrier support – Contact your UK carrier to confirm they support VoWiFi on your device model.
  • ✔ Enable in Settings – Settings → SIM cards & mobile networks → Your SIM → Enable "Make calls using Wi-Fi".
  • ✔ Enable VoWiFi with code – Dial *#*#869434#*#* in the Phone app to toggle VoWiFi on.
  • ✔ Ensure VoLTE is enabled – VoWiFi often requires VoLTE to be active.
  • ✔ Check your ROM version – Global ROM supports WiFi Calling; Chinese CN ROM may have limited support.
  • ✔ Check your SIM card – Older SIM cards may have compatibility issues with some network features. Contact your carrier if you suspect your SIM needs replacement.

Quick Reference – Find Your Fix

ProblemMost Likely CauseFix
WiFi Calling option not visible in SettingsCarrier doesn't support this device, ROM version, or SIM issueCheck carrier support; check ROM; update SIM
Option visible but greyed outVoLTE disabled or no WiFi connectionEnable VoLTE; connect to WiFi
Option enabled but calls not using WiFiWiFi signal weak or carrier provisioningTest in poor cellular coverage area; contact carrier
Option disappeared after updateHyperOS update reset settingsRe-enable via Settings or engineering code

Quick Answer

If your Xiaomi WiFi Calling option is missing, the most common causes are: your UK carrier doesn't support VoWiFi on your specific Xiaomi model, you're using a Chinese ROM (CN) that may have limited VoWiFi support, or your SIM card may not be compatible. Start by contacting your carrier to confirm support, then check your ROM version in Settings → About phone. If you're on Global ROM, try enabling VoWiFi using the engineering code *#*#869434#*#* in the Phone app.

Before You Start

  • Check your carrier supports WiFi Calling – EE, O2, Vodafone, and Three all support VoWiFi, but not every Xiaomi model is on their approved list.
  • Check your phone's ROM version – Go to Settings → About phone → MIUI/HyperOS version. If you see CN (Chinese ROM), WiFi Calling may not be available. Global ROM (MI) or EEA (EU) ROM is required for full UK carrier support.
  • Check your SIM card – Older SIM cards may have compatibility issues with some network features. Contact your carrier if you suspect your SIM needs replacement.
  • Ensure you're on the latest software – Settings → About phone → Check for updates.

Why WiFi Calling Goes Missing on Xiaomi

Understanding why this happens helps you fix it correctly:

Carrier-Related Causes

  • Carrier doesn't support this Xiaomi model – Each UK carrier maintains a list of approved devices for WiFi Calling. Even if the phone supports VoWiFi, the carrier may not have enabled it for your specific model.
  • Carrier provisioning required – Some carriers need to activate VoWiFi on your account before the option appears.
  • Carrier-specific settings – Some UK networks require specific APN settings for VoWiFi to work.

Phone-Related Causes

  • Chinese ROM (CN) – Xiaomi phones with Chinese ROM may have limited VoWiFi support depending on region, carrier configuration and Xiaomi firmware.
  • SIM card compatibility – Older SIM cards may not support the necessary protocols for VoWiFi.
  • VoLTE disabled – VoWiFi often requires VoLTE (4G Calling) to be enabled.
  • Settings relocated in HyperOS – Updates may move the WiFi Calling option to a different menu location.
  • Engineering code needed – Some Xiaomi models require the VoWiFi carrier check to be disabled using a code before the option appears.

Step-by-Step Fixes

Step 1: Contact Your UK Carrier

Before changing any settings, confirm that your carrier supports WiFi Calling on your specific Xiaomi model. Each UK carrier maintains a list of supported devices.

  • EE – Call 150 or check the EE website for supported devices
  • O2 – Call 202 or check O2's support pages
  • Vodafone – Call 191 or check Vodafone's device support
  • Three – Call 333 or check Three's support pages
  • MVNOs (Giffgaff, Lebara, SMARTY, Tesco Mobile) – Contact customer support to confirm VoWiFi support

Step 2: Enable VoWiFi via Engineering Code

On some Xiaomi devices, the WiFi Calling option is hidden behind a carrier compatibility check. This code changes Xiaomi's VoWiFi carrier check setting. It may reveal the WiFi Calling option on some devices, but it cannot add carrier support if your network does not officially support your Xiaomi model.

  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 Settings → SIM cards & mobile networks for the WiFi Calling option

Note: This code toggles Xiaomi's carrier compatibility check for VoWiFi. It doesn't guarantee your carrier supports it, but it allows your phone to display the option.

Step 3: Enable WiFi Calling in Settings

Once the option is available, enable it:

  1. Settings → SIM cards & mobile networks
  2. Tap your carrier's SIM
  3. Look for "Make calls using Wi-Fi", "WiFi Calling", or "VoWiFi"
  4. Toggle it ON

Visual Path: Settings → SIM cards & mobile networks → [Your carrier] → Make calls using Wi-Fi → ON

Step 4: Ensure VoLTE (4G Calling) Is Enabled

VoWiFi often requires VoLTE to be enabled. On many Xiaomi devices, these two features are linked.

  • In the same menu (Settings → SIM cards & mobile networks → Your SIM), look for "Use VoLTE" or "4G Calling"
  • Ensure it's toggled ON
  • If VoLTE is greyed out, contact your carrier to enable it on your account

Step 5: Check Your ROM Version

Xiaomi phones with Chinese ROM (CN) may have limited VoWiFi support depending on region, carrier configuration and Xiaomi firmware.

  1. Settings → About phone
  2. Look at the MIUI/HyperOS version
  3. If you see CN at the end, you're on Chinese ROM
  4. Global ROM (MI) or EEA (EU) ROM support VoWiFi with UK carriers
  5. If you have CN ROM, you may need to flash Global ROM (advanced procedure) or accept that VoWiFi may not work

    6. Step 6: Check Your SIM Card

    Older SIM cards may have compatibility issues with some network features. Contact your carrier if you suspect your SIM needs replacement.

    • Contact your UK carrier and request a new SIM card if you suspect yours is outdated
    • Carriers like EE, O2, Vodafone, and Three usually provide replacements for free
    • Once you receive the new SIM, activate it and test WiFi Calling again

    Step 7: Reset Network Settings

    If the option still doesn't appear, resetting network settings can clear any corrupted 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. Re-enable WiFi Calling using the steps above

    Step 8: Update HyperOS / MIUI

    Xiaomi releases updates that fix connectivity issues.

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

    UK Carrier-Specific WiFi Calling Information

    EE, O2, Vodafone and Three support WiFi Calling, but availability depends on your Xiaomi model, firmware version and account settings.

    CarrierNotes
    EEAvailability depends on Xiaomi model and EE compatibility list
    O2Depends on supported device and account settings
    VodafoneCheck supported device list
    ThreeDepends on device compatibility
    MVNOs (Giffgaff, Lebara, SMARTY, Tesco)Varies by MVNO and plan – contact customer support directly

    What to Do If WiFi Calling Still Doesn't Work

    If WiFi Calling is enabled but calls aren't using WiFi, or the option is still missing:

    • Test in an area with poor cellular coverage – WiFi Calling activates when cellular signal is weak
    • Ensure your WiFi connection is stable – Poor WiFi can prevent VoWiFi from working
    • 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 appear 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 option is missing, the most common cause is carrier compatibility. Contact your UK carrier to confirm support for your device model. If the option is hidden, use the engineering code *#*#869434#*#* to disable the carrier check. Ensure your phone has Global ROM and a compatible SIM card. If the issue persists, check your ROM version, update your SIM, or reset network settings.

    Quick summary:

    • Option not visible → Check carrier support, ROM version, and SIM compatibility
    • Option greyed out → Enable VoLTE first; connect to WiFi
    • Option disappeared after update → Use engineering code to re-enable
    • Calls not using WiFi → Test in poor cellular coverage area; contact carrier

    Frequently Asked Questions

    Why is WiFi Calling missing on my Xiaomi?

    Common causes include: your carrier doesn't support VoWiFi on your specific Xiaomi model, you're using Chinese ROM (CN) which may have limited support, your SIM card may not be compatible, or the setting has been relocated in HyperOS.

    How do I enable WiFi Calling on Xiaomi?

    Go to Settings → SIM cards & mobile networks → Your SIM → Enable "Make calls using Wi-Fi". If the option is hidden, dial *#*#869434#*#* in the Phone app first.

    What does *#*#869434#*#* do on Xiaomi?

    This engineering code toggles Xiaomi's carrier compatibility check for VoWiFi. If it says "VoWiFi carrier was disabled," the check has been disabled. Restart your phone and check whether the WiFi Calling option becomes available.

    Does WiFi Calling work on UK Xiaomi devices?

    Yes, if you have Global ROM and your UK carrier supports VoWiFi on your specific Xiaomi model. EE, O2, Vodafone, and Three all offer VoWiFi, but not every Xiaomi model is approved.

    Why is WiFi Calling greyed out on Xiaomi?

    WiFi Calling often requires VoLTE to be enabled. Go to Settings → SIM cards & mobile networks → Your SIM and enable VoLTE. If VoLTE is unavailable, contact your carrier.

    Does Chinese ROM support WiFi Calling?

    Chinese ROM versions may have limited VoWiFi support depending on region, carrier configuration and Xiaomi firmware. For reliable UK carrier support, Global ROM (MI) or EEA (EU) ROM is recommended.

    How do I check my Xiaomi ROM version?

    Go to Settings → About phone → MIUI/HyperOS version. If you see CN at the end, you have Chinese ROM. If you see MI or EEA, you have Global or EU ROM.

    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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