Xiaomi VoLTE Option Missing on EE Devices

Xiaomi VoLTE Missing on EE After HyperOS Update – UK Fix

This guide helps if your Xiaomi VoLTE toggle is missing, greyed out, or not showing in settings on EE after a HyperOS update, even though your device and network support it.

Quick Answer:
If VoLTE is missing on your Xiaomi with EE, first check Settings → SIM cards & mobile networks → EE SIM → Preferred network type is set to 5G/4G/3G auto. If the toggle is still missing, dial *#*#86583#*#* and restart – this restores the toggle on many supported Xiaomi devices. If the toggle is greyed out, contact EE to confirm VoLTE is 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 the EE UK network. EE enables VoLTE automatically on compatible plans, but changes to your SIM profile after a software update can occasionally delay activation until the device reconnects to the network.

🔍 Quick Diagnostic Table

What you seeWhat it usually means
VoLTE toggle missing entirelyCarrier check re-enabled
VoLTE toggle greyed outCarrier provisioning issue
VoLTE toggle ON but calls drop to 3GIMS registration failure
VoLTE disappeared after HyperOS updateSettings reset or carrier check
VoLTE missing on one SIM onlyDual SIM or slot issue

🔍 Quick Start – Find Your Path

SymptomMost Likely CauseGo To
VoLTE toggle missing entirelyCarrier check re-enabledSection 1
VoLTE toggle greyed outCarrier provisioning issueSection 2
VoLTE ON but calls drop to 3GIMS registration failureSection 3
VoLTE disappeared after HyperOS updateSettings resetSection 4
VoLTE missing on one SIM onlyDual SIM or slot issueSection 5

Section 1 – VoLTE Toggle Missing Entirely (Most Common)

When VoLTE disappears on EE, in many cases HyperOS has re-enabled Xiaomi's hidden carrier compatibility check – either after an update or a network refresh.

Try these in order:

  1. Check preferred network type – Settings → SIM cards & mobile networks → EE SIM → Preferred network type → Select 5G/4G/3G auto (not "4G only" or "3G only").
  2. Dial the hidden code – On supported Xiaomi models, open Phone dialer → dial *#*#86583#*#* → you should see "VoLTE carrier check was disabled". This code doesn't work on all HyperOS versions or all devices.
  3. Restart your phone – After dialling, restart and check if the VoLTE toggle appears.
  4. Check the toggle location – Settings → SIM cards & mobile networks → EE SIM → VoLTE should now appear.
  5. If nothing happens – Your device doesn't support this code – proceed to Section 2.

Why this works: This code disables Xiaomi's built-in carrier compatibility check, allowing the VoLTE option to appear on supported devices where the network already supports the feature.

Section 2 – Toggle Greyed Out (Carrier Provisioning Issue)

If the VoLTE toggle is visible but greyed out, EE may not have enabled VoLTE on your account or SIM profile.

Try these in order:

  1. Remove and reinsert the SIM card – Power off → remove SIM → wait 10 seconds → reinsert firmly → power on → check if the toggle is now active.
  2. Call EE – 150 or 0800 956 6000.
  3. Ask directly – "VoLTE is greyed out on my Xiaomi – is it enabled on my account? Please refresh your network provisioning or SIM profile."
  4. Restart your phone – After they confirm, restart and check if the toggle is now active.
  5. Check SIM compatibility – If your SIM is older than 3-4 years, it may not support VoLTE. Request a replacement SIM from EE.

Section 3 – VoLTE ON but Calls Drop to 3G (IMS Registration Failure)

If VoLTE is enabled (toggle is ON) but calls drop from 4G/5G to 3G, the issue is likely IMS registration failure.

Try these in order:

  1. Check IMS registration – If your device supports the Phone Information menu, dial *#*#4636#*#* → Phone information → look for "IMS registered". If false, the phone isn't registered for VoLTE services. This menu is not available on all devices.
  2. Toggle Airplane mode – ON for 30 seconds, then OFF. This forces IMS re-registration.
  3. Disable VPN temporarily – Some VPNs can prevent IMS registration on certain networks.
  4. Check VoLTE toggle – Settings → SIM cards & mobile networks → EE SIM → VoLTE → toggle OFF, wait 10 seconds, then toggle ON.
  5. Restart your phone – A full reboot can resolve IMS registration issues.
  6. Test a call – Make a call while on 4G/5G. If the 4G/5G icon stays visible, VoLTE is now working.

Note: If IMS registration remains unavailable after restarting and confirming VoLTE provisioning with EE, the issue is usually on the carrier side rather than the handset.

Section 4 – VoLTE Disappeared After HyperOS Update

If VoLTE stopped appearing after a HyperOS update, the update may have reset network settings or re-enabled the carrier check.

Try these in order:

  1. Dial the hidden code – Section 1.
  2. Check preferred network type – Set to 5G/4G/3G auto.
  3. Check VoLTE toggle – Settings → SIM cards & mobile networks → EE SIM → VoLTE → ON.
  4. Check system app updates – Settings → System app updater → check for updates to carrier-related system apps.
  5. Restart after installing the update – Carrier settings often don't apply until after a reboot.
  6. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth (last resort – removes saved Wi-Fi passwords).

Section 5 – VoLTE Missing on One SIM Only (Dual SIM or Slot Issue)

If VoLTE is missing on one SIM but appears on the other, the issue is likely SIM slot or dual SIM configuration.

Try these in order:

  1. Swap SIM slots – Power off → move the EE SIM to the other slot → power on → check if VoLTE appears.
  2. Set EE as default for calls – Settings → SIM cards & mobile networks → Default for calls → Select EE.
  3. Disable the second SIM temporarily and restart – Some users with Dual SIM have reported this resolves the issue.
  4. Check SIM compatibility – If one SIM is older than the other, the older SIM may not support VoLTE. Contact EE for a replacement.

Why Is VoLTE Missing on EE?

  • VoLTE carrier check re-enabled (most common) – EE's carrier check may hide VoLTE. The code *#*#86583#*#* disables this on many devices.
  • Carrier provisioning issue – VoLTE may not be enabled on your EE account.
  • IMS registration failure – The phone isn't registered for IMS services.
  • SIM compatibility – SIMs older than 3-4 years may not support VoLTE.
  • Preferred network type – If set to "4G only" or "3G only", VoLTE won't appear.
  • HyperOS update – Updates can reset carrier check or network settings.
  • Carrier settings update after HyperOS installation – May temporarily affect VoLTE.

⚠️ What NOT to Do

  • Don't factory reset your phone – This is rarely needed for VoLTE issues.
  • Don't assume the code works on all devices – *#*#86583#*#* works on many but not all Xiaomi models or HyperOS versions.
  • Don't ignore carrier provisioning – If the toggle is greyed out, call EE first.

Quick Questions

Why is VoLTE missing on my Xiaomi EE?
Most commonly the VoLTE carrier check was re-enabled. Dial *#*#86583#*#* and restart to restore it on many devices.

Does the code *#*#86583#*#* work on all Xiaomi phones?
No. It works on many but not all devices or HyperOS versions. If nothing happens, try carrier provisioning instead.

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

Why does my call drop from 4G to 3G on EE?
This usually means VoLTE is not working – check IMS registration or contact EE.

Will resetting network settings fix VoLTE?
It can help if settings are corrupted, but try the hidden code and carrier provisioning first.

Can a new SIM fix VoLTE issues?
Yes. SIMs older than 3-4 years may not support VoLTE. Request a replacement from EE.

How do I check if VoLTE is working?
Make a call while on 4G/5G. If the 4G/5G icon stays visible during the call, VoLTE is working.

Why did VoLTE disappear after a HyperOS update?
The update may have re-enabled the carrier check or reset network settings. Try the hidden code and check preferred network type.

Why is VoLTE available on one SIM but not the other?
This is usually a SIM slot or dual SIM configuration issue. Try swapping SIM slots or disabling the second SIM temporarily.

Can a software update disable VoLTE?
Yes. HyperOS updates can reset carrier check or network settings. Check your settings after updates.

Why do my calls switch to H+ during calls?
This means VoLTE is not working – the call drops to 3G/H+. Check IMS registration or contact EE.

Does EE support VoLTE on all Xiaomi phones?
EE supports VoLTE on most recent UK Xiaomi models. Some imported models or older devices may not be supported.

Why can't I see the VoLTE icon anymore?
HyperOS on some models doesn't display the VoLTE icon even when the feature is active. If calls stay on 4G/5G during calls, VoLTE is working despite the missing icon.

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