Xiaomi WiFi Calling Option Disappeared Overnight

Quick Answer:
If your Xiaomi lost the WiFi Calling (VoWiFi) toggle overnight, first restart your phone. If that doesn't bring it back, call your carrier (EE: 150, O2: 202, Vodafone: 191, Three: 333) and ask if WiFi Calling is still enabled on your account – this is the most common cause. In some cases, dialling *#*#869434#*#* may help (works on some devices).

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS, including Redmi Note series, POCO X/F series, and Xiaomi flagships.

🔍 Quick Start – What to Do First (Priority Order)

  • Step 1 – Restart your phone. A simple reboot sometimes refreshes the connection.
  • Step 2 – Call your carrier. Ask if WiFi Calling is still enabled on your account. This is the most likely cause.
  • Step 3 – If the toggle is still missing, try the hidden code – *#*#869434#*#* (works on some devices).
  • Step 4 – If nothing works, check IMS registration (Section 3).

Section 1 – Most Likely Cause: Carrier Provisioning Change

WiFi Calling can disappear if your carrier changed something on your account – a plan update, billing cycle reset, or SIM profile refresh. This is the most common cause.

Try these in order:

  1. Restart your phone – A simple reboot can sometimes refresh the connection.
  2. Call your carrier – EE (150), O2 (202), Vodafone (191), Three (333).
  3. Ask directly: "WiFi Calling was working but has disappeared – is it still enabled on my account? Can you re-enable it and send a new SIM profile?"
  4. Restart your phone – After they confirm, restart and check if the toggle reappears.

Section 2 – Hidden Carrier Check (Optional Check – Works on Some Devices)

Xiaomi sometimes hides WiFi Calling behind a carrier check. On certain devices, the code *#*#869434#*#* may disable this check. However, this does not work on all devices or HyperOS versions – it's a useful step to try, but not a guaranteed fix.

Try this if it works on your device:

  1. Dial the hidden code – Open Phone dialer → dial *#*#869434#*#*. If it works, you will see "VoWiFi carrier check was disabled".
  2. Restart your phone – After dialling, restart and check if the WiFi Calling toggle has reappeared.
  3. If nothing happens: Your device doesn't support this code – proceed to Section 3.

Section 3 – Network Registration or IMS Issue

If the toggle is missing but you've confirmed your carrier has WiFi Calling enabled, the issue may be on your phone's network registration side.

Try these in order:

  1. Check IMS registration – Dial *#*#4636#*#* → Phone information → look for "IMS registered". If false, this can indicate a registration issue in some cases – but it's not always definitive.
  2. Toggle Airplane mode – ON for 30 seconds, then OFF. This forces the phone to reconnect to the network.
  3. Check preferred network type – Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → Select 5G/4G/3G auto.
  4. Test if WiFi Calling works without the toggle – Make a call while connected to WiFi with weak or no mobile signal. If the call connects, WiFi Calling is actually working – the missing toggle may just be a display bug.
  5. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth (last resort – removes saved Wi-Fi passwords).

Section 4 – Less Common: System Update or Region Change

If WiFi Calling disappeared after a HyperOS update or a region change, the update may have reset carrier settings.

Try these in order:

  1. Check your region setting – Settings → Additional settings → Region → ensure it's set to United Kingdom – some regions hide WiFi Calling.
  2. Check for system app updates – Settings → System app updater → check for updates to carrier-related apps.
  3. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth (last resort).

⚠️ What NOT to Do

  • Don't factory reset your phone – WiFi Calling disappearance is almost never solved by a factory reset.
  • Don't assume your carrier removed it without checking – call them first (Section 1).
  • Don't rely solely on the hidden code – it doesn't work on all devices.

Why Did WiFi Calling Disappear?

  • Carrier provisioning change (most common): Plan update, billing cycle reset, or SIM profile refresh.
  • Hidden carrier check re-enabled: Can happen after background network refresh – the code may help on some devices.
  • Network registration or IMS issue: The phone may have lost registration and failed to reconnect.
  • System update or region change: Updates can reset carrier settings or region preferences.

Quick Questions

Why did my WiFi Calling option disappear overnight on Xiaomi?
Most commonly your carrier may have changed something on your account (plan, billing cycle, or SIM profile). Start with Section 1 – call your carrier.

Does the code *#*#869434#*#* work on all Xiaomi phones?
No. It works on many but not all devices or HyperOS versions. If nothing happens, your device doesn't support it – try carrier provisioning instead.

What if the WiFi Calling toggle is missing but calls still work over WiFi?
WiFi Calling may still be working – the toggle is just hidden. Make a test call with weak mobile signal and WiFi on. If it connects, WiFi Calling is active.

Can a carrier remove WiFi Calling from my account overnight?
Yes – if your plan changed, billing cycle reset, or SIM profile was refreshed. Call your carrier to check.

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

Summary – Quick Reference

ScenarioWhat to try first
Toggle was there yesterday, gone todayRestart → call carrier (Section 1)
Code works on your deviceDial *#*#869434#*#* + restart (Section 2)
After overnight updateCheck region → reset network settings (Section 4)
Still missingCheck IMS registration + test SIM in another phone (Section 3)

Comments

Post a Comment

Popular Guides at UK Xiaomi

Xiaomi WiFi Calling Stops Working After HyperOS Update

Xiaomi WiFi Calling Stops Working After HyperOS Update – UK Fix This guide helps if your Xiaomi WiFi Calling (VoWiFi) stopped working or disappeared completely after a HyperOS update, even though it worked before the update. Quick Answer: If WiFi Calling stopped working after a HyperOS update, first check whether the WiFi Calling toggle is still present in Settings → SIM cards & mobile networks → [Your carrier] SIM → WiFi Calling. If the toggle is missing, try dialling *#*#869434#*#* (VoWiFi carrier check disable) and restarting – this restores the toggle on many Xiaomi devices. If the toggle is greyed out or doesn't work, contact your carrier to check WiFi Calling is still enabled on your account. Applies to Redmi, POCO and Xiaomi Phones This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS on all UK carriers – EE, O2, Vodafone, Three, and their MVNOs. 🔍 Quick Diagnostic – Toggle vs Function ...
Read more

Xiaomi Calls Going Straight to Voicemail on O2

Xiaomi Calls Going Straight to Voicemail on O2 – UK Fix This guide also helps if your Xiaomi is not receiving calls on O2 even though signal appears normal. Quick Answer: If your Xiaomi calls go straight to voicemail on O2, first check Do Not Disturb is OFF – swipe down the notification shade and tap the DND icon to disable it. Then check Call Forwarding: Phone app → three dots → Settings → Calling accounts → O2 → Call forwarding → ensure "Always forward" is OFF. Also check Blocked numbers and enable VoLTE. If the problem only happens in certain locations, it may be coverage-related. Applies to Redmi, POCO and Xiaomi Phones This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS on the O2 UK network, including MVNOs like Giffgaff, Sky Mobile, and Tesco Mobile. 🔍 Quick Start – Find Your Path Symptom Most Likely Cause Go To All calls go strai...
Read more

Xiaomi Audio Problems on HyperOS Devices Explained

Xiaomi Audio Problems on HyperOS Devices Explained – UK Guide HyperOS audio problems can affect the phone speaker, wired headphones, USB-C earphones, Bluetooth devices, microphones and car audio systems. Although many issues look similar, they usually have different causes. This guide helps you identify the symptom first, then directs you to the appropriate troubleshooting guide. Quick Answer: Most HyperOS audio issues are caused by incorrect volume settings, Bluetooth routing, Dolby Atmos, Bluetooth codec selection, equalizer settings, microphone permissions or hardware faults. Use the diagnostic table below to identify the correct troubleshooting guide. Start Here – Find Your Problem No sound at all → Go to Speaker & Headphone Audio Problems Bluetooth connected but silent → Go to Bluetooth Connected But No Sound Speaker too quiet → Go to Speaker Volume Low Bluetooth audio sounds poor → Go t...
Read more

Xiaomi Bluetooth Connected But No Sound Issue Fix

Xiaomi Bluetooth Connected But No Sound Issue Fix – UK Guide If your Xiaomi, Redmi, or POCO device shows as connected to a Bluetooth speaker, headphones, or car system but no sound comes out, this guide covers the most common causes and how to fix them. Quick Answer: If your Xiaomi is connected to Bluetooth but no sound plays, first check that the media volume is turned up on your phone. Then check the Bluetooth device settings: Settings → Connection & sharing → Bluetooth → tap the gear icon next to your device → ensure Media audio is enabled. Also check that the Bluetooth device itself is turned on and not muted. Restart your phone and re-pair the device if the issue persists. 🔍 Quick Diagnostic Table What you see What it usually means Device shows as connected but no sound Media audio disabled or volume issue Music plays but no sound Bluetooth device muted or vo...
Read more

Xiaomi Internet Stops Working After Midnight

Xiaomi Internet Stops Working After Midnight – UK Fix If your Xiaomi, Redmi, or POCO device loses internet connection at night—whether it's WiFi dropping, mobile data disconnecting, or both—this guide explains the most common causes and how to fix them. Quick Answer: If your internet stops working after midnight, first check whether other devices on the same network are also affected. Then, if available on your device, go to Settings → Wi-Fi → Additional settings (if available) → set "Keep Wi-Fi on during sleep" to Always. If that doesn't help, check Settings → Battery → Additional features → turn OFF "Clear cache when device is locked" (if available). Also check your router for scheduled reboots—some routers are configured to restart automatically overnight. 🔍 Quick Diagnostic Table What happens What it usually means Go To WiFi disconnects at night, rec...
Read more

Xiaomi Sound Quality Worse After Update

Xiaomi Sound Quality Worse After Update – UK Fix If your Xiaomi, Redmi, or POCO device started sounding worse after a system update—tinny, muffled, distorted, or lacking bass—this guide explains why it happened and how to fix it. Quick Answer: If sound quality dropped after an update, first check that your settings haven't been reset. Updates can affect Dolby Atmos, Bluetooth codecs, equalizer settings, accessibility audio, media output routing, Bluetooth profiles, app permissions, or audio effects. Try toggling Dolby Atmos off temporarily: Settings → Sound & vibration → Dolby Atmos → toggle OFF. Restart your phone. If the issue is a known bug, a system patch may be coming—check for updates regularly. 🔍 Quick Diagnostic Table What you hear What it usually means Sound tinny, lacking bass after update Dolby Atmos clash or codec reset Muffled or distorted sound Do...
Read more

Xiaomi WiFi Calling Stops Working After HyperOS Update

Quick Answer: If WiFi Calling (VoWiFi) is not working or missing on your Xiaomi after a HyperOS update, first dial *#*#869434#*#* (disables carrier check on some devices), restart, then check Settings → SIM cards & mobile networks → [Your UK carrier] SIM → WiFi Calling. If still missing, toggle Airplane mode on/off and re-enable WiFi Calling. How to Fix Xiaomi WiFi Calling After HyperOS – 5 Quick Steps Disable VoWiFi carrier check (if available) – Dial *#*#869434#*#* , then restart Toggle WiFi Calling off/on – Settings → SIM cards & mobile networks → [Carrier] SIM → WiFi Calling → OFF → wait 10 seconds → ON Toggle Airplane mode – ON for 30 seconds, then OFF Check carrier provisioning – Contact your carrier to confirm WiFi Calling is enabled on your account Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth Why This Happens ...
Read more

Xiaomi Equalizer Settings: Best Sound for Headphones & Earbuds (UK 2026)

How to Boost Headphone Bass on Xiaomi Phones (MIUI Guide for UK Users) Music is closely tied to emotions, and for many UK users, headphones are a constant companion throughout the day—whether commuting in London , relaxing in a Manchester flat, or catching up on podcasts in Birmingham . Naturally, everyone wants the best possible sound quality from their Xiaomi device, without relying on third-party apps that take up storage space. Why Bass Matters Before boosting headphone bass, it’s worth understanding the basics. Humans can hear frequencies from 20Hz to 20kHz. The lower end, below 250Hz, represents bass sounds. Within this range, the lowest frequencies contribute to deep bass, while slightly higher frequencies provide “punchy” bass. MIUI’s equaliser allows you to tweak these frequencies, regardless of the headphone model—be it Mi AirDots , Redmi AirDots S, or higher-end wired headphones. Setting up the equaliser properly is crucial for achieving the richest sound experience...
Read more

Xiaomi Sound Not Working After HyperOS Update

Xiaomi Sound Not Working After HyperOS Update – UK Fix If your Xiaomi, Redmi, or POCO device has lost all sound after a HyperOS update—no ringtone, no media audio, no notification sounds—this guide helps you diagnose and fix the issue. Although this guide focuses on HyperOS, many of the same troubleshooting steps also apply to devices running recent MIUI versions. Quick Answer: If sound stopped working after a HyperOS update, first check your volume settings, Do Not Disturb, and Bluetooth connections. Restart your phone and check for available updates. Some HyperOS releases have introduced audio issues on specific Xiaomi, Redmi and POCO models—a software issue introduced by a recent update may be the cause. If other users report the same behaviour on the same software version, check for a newer OTA update before assuming the speaker is faulty. 🔍 Quick Diagnostic Table What you see What it usually means Go To ...
Read more

Xiaomi Equalizer Missing in Settings (HyperOS)

Xiaomi Equalizer Missing in Settings (HyperOS) – UK Fix If the graphic equalizer has disappeared from your Xiaomi's Sound settings after a HyperOS update, you're not alone. This guide explains where to find it, why it may be missing, and how to restore advanced audio controls. Quick Answer: If the equalizer is missing, first connect headphones – the equalizer is often hidden without them. Then check Settings → Sound & vibration → Sound effects → Graphic equalizer. If you only see Dolby Atmos presets, the equalizer may have been integrated into that menu. Applies to Redmi, POCO and Xiaomi Phones This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS, including Redmi Note series, POCO X/F series, and Xiaomi flagships. 🔍 Quick Diagnostic Table What you see What it usually means Equalizer missing from Sound settings Hidden without headphones...
Read more