Xiaomi WiFi Calling Option Disappeared Overnight

Xiaomi WiFi Calling Option Disappeared Overnight – UK Fix

If you woke up to find the WiFi Calling (VoWiFi) option missing from your Xiaomi, Redmi, or POCO device, this guide explains why it happened and how to bring it back.

Quick Answer:
If WiFi Calling disappeared overnight, first try dialling *#*#869434#*#* in the Phone app – this often restores the toggle on many Xiaomi devices. Then restart your phone and check Settings → SIM cards & mobile networks → [Your carrier] SIM → ensure WiFi Calling is enabled. If the option is still missing, contact your carrier to confirm VoWiFi is still active on your account.

🔍 Quick Diagnostic Table

What you seeWhat it usually means
WiFi Calling toggle completely missingCarrier compatibility check enabled or carrier provisioning issue
WiFi Calling toggle greyed outCarrier hasn't provisioned VoWiFi on your account
WiFi Calling option disappeared after a HyperOS updateSystem update reset settings
WiFi Calling works but keeps disconnectingAdGuard, VPN, or battery optimisation interfering
WiFi Calling option missing but was there yesterdayHidden code reset or carrier-side change

Section 1 – Try the Hidden Code (Most Common Fix)

Xiaomi devices use a hidden carrier compatibility check that can hide WiFi Calling for carriers that aren't on an approved list. If this carrier compatibility check becomes enabled again after a software update or other system change, the WiFi Calling toggle may disappear.

Try this first:

  1. Dial the hidden code – Open the Phone app and dial *#*#869434#*#*. You should see a message saying "VoWiFi carrier check was disabled" or "VoWiFi carrier check is disabled".
  2. Restart your phone – After dialling the code, restart your device.
  3. Check the toggle – Settings → SIM cards & mobile networks → [Your carrier] SIM → WiFi Calling should now appear.

Note: This code works on many Xiaomi devices, but may not work on all models or HyperOS versions. If nothing happens, your device may not support this code.

Section 2 – Check Your Carrier Provisioning

If the toggle is greyed out or still missing after the hidden code, your carrier may have disabled WiFi Calling on your account – this can happen after a SIM reprovision, account change, plan change or carrier-side update.

Try these in order:

  1. Restart your phone – A simple reboot can sometimes refresh the connection.
  2. Toggle Airplane mode – ON for 30 seconds, then OFF. This often prompts the phone to re-register with the IMS service.
  3. Remove and reinsert your SIM – Power off → remove SIM → reinsert firmly → power on. This can refresh the SIM profile.
  4. Check your account – Log into your carrier's app or call customer service. Ask: "Is WiFi Calling enabled on my account? Can you refresh my SIM profile?"
  5. Check SIM age – If you're using an older SIM that predates your carrier's WiFi Calling rollout, your carrier may recommend a replacement SIM.

Section 3 – Check for App Conflicts (AdGuard, VPN)

Ad-blockers, VPNs, or DNS filters can interfere with IMS (IP Multimedia Subsystem) registration, which can prevent WiFi Calling from connecting or registering correctly.

Try these in order:

  1. Disable AdGuard or any ad-blocker temporarily – Some users have reported that ad-blockers prevent WiFi Calling from activating, especially when reconnecting to WiFi.
  2. Disable VPN – If you're using a VPN, try turning it off and reconnecting to WiFi.
  3. Restart your phone – After disabling these apps, restart and check if WiFi Calling reappears.
  4. Test with a different WiFi network – If the issue only occurs on one network, the problem may be network-related.

Section 4 – Check After a HyperOS Update

HyperOS updates can sometimes reset network settings or change carrier configuration behaviour, which may cause the WiFi Calling option to disappear on some devices.

Try these in order:

  1. Run the hidden code again – See Section 1.
  2. Check preferred network type – Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → set to 5G/4G/3G auto.
  3. Check system app updates – Settings → System app updater → check for updates to carrier-related apps.
  4. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth (last resort – removes saved Wi-Fi passwords).

eSIM Considerations

If you use an eSIM, ask your carrier to refresh or reissue the eSIM profile if WiFi Calling suddenly disappears. Some UK carriers can refresh an existing eSIM profile remotely, while others may require you to download a replacement profile.

Why Did WiFi Calling Disappear?

  • Carrier compatibility check – Xiaomi's hidden carrier compatibility check can become enabled again after a software update or other system change.
  • Carrier provisioning change – Your carrier may have changed your account or SIM profile.
  • HyperOS update – System updates can reset network settings or change carrier configuration behaviour, which may affect WiFi Calling availability.
  • AdGuard, VPN or DNS filter interference – Some apps can block IMS registration.
  • Region or carrier compatibility – On some devices, the option may be hidden based on region or carrier whitelist.

⚠️ What NOT to Do

  • Don't factory reset your phone – This is rarely needed for WiFi Calling issues and won't fix a carrier check or provisioning problem.
  • Don't change your region – Changing region settings can affect other features and is not a reliable fix.
  • Don't assume the feature is permanently removed – In most cases, the hidden code restores it.

Quick Questions

Why did my WiFi Calling option disappear overnight?
Most commonly, Xiaomi's hidden carrier compatibility check became enabled again after a software update or other system change. Dial *#*#869434#*#* and restart to restore it on many devices.

Does the code *#*#869434#*#* work on all Xiaomi phones?
No. It works on many but not all devices or HyperOS versions. If nothing happens, check carrier provisioning instead.

What if WiFi Calling is greyed out?
Your carrier may not have enabled it on your account. Call them to refresh your SIM profile or network provisioning.

Can AdGuard or VPN stop WiFi Calling from working?
Yes. Some ad-blockers and VPNs can interfere with IMS registration, preventing WiFi Calling from connecting or registering correctly.

Will resetting network settings help?
It can help if settings are corrupted, but try the hidden code and carrier provisioning first – resetting removes saved Wi-Fi passwords and Bluetooth devices.

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