Xiaomi Cannot Enable VoLTE in the UK

Quick Answer:
If the VoLTE toggle is missing or greyed out on your Xiaomi in the UK, first dial *#*#86583#*#* (disables carrier check on some devices), then restart. After restart, go to Settings → SIM cards & mobile networks → [Your carrier] SIM → VoLTE should now appear. If still missing, contact your carrier to check VoLTE is correctly provisioned on your account or SIM profile (EE: 150, O2: 202, Vodafone: 191, Three: 333).

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS, including models such as Redmi Note series, POCO X series, POCO F series and Xiaomi flagship devices (Xiaomi 14, Xiaomi 15, etc.).

Check If Your Carrier Supports VoLTE

EE, O2, Vodafone, Three, Giffgaff, SMARTY and VOXI all support VoLTE on many recent Xiaomi devices. If you're unsure, contact your carrier before continuing.

Before Anything Else

Check whether VoLTE is actually working even if the toggle is missing. Make a call while on 4G or 5G:

  • If the 4G/5G icon stays visible during the call: VoLTE is already working. The missing toggle is just a HyperOS display issue – no fix needed.
  • If the call drops to 3G or H+: VoLTE is not working. Continue with the fixes below.

Quick Fixes – Try These First

  1. Disable carrier check (hidden code) – Dial *#*#86583#*#*, then restart. This works on many Xiaomi devices.
  2. Check carrier provisioning – Call your carrier and ask "Is VoLTE correctly provisioned on my account or SIM profile?"
  3. Enable VoLTE in settings – Settings → SIM cards & mobile networks → [Carrier] SIM → VoLTE → ON.
  4. Check preferred network type – Settings → SIM cards & mobile networks → [Carrier] SIM → Preferred network type → Select 5G/4G/3G auto (not "3G only").
  5. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth. (Last resort)

What Usually Causes This

  • Hidden carrier check blocks VoLTE toggle – Xiaomi hides VoLTE for some carriers by default. The code *#*#86583#*#* disables this check on many devices.
  • Carrier hasn't provisioned VoLTE correctly on your account or SIM profile – Even if your phone supports VoLTE, your carrier may need to enable it on their side.
  • Phone stuck on 3G mode – VoLTE only works when the phone is on 4G or 5G. If preferred network type is "3G only", VoLTE won't appear.
  • Very old SIM card – Very old SIM cards may not contain the latest carrier profiles required for VoLTE services. Request a replacement if needed.

Fix 1 – Disable Carrier Check (Hidden Code)

On many Xiaomi devices, the code *#*#86583#*#* disables the carrier check and restores the VoLTE option. This is one of the first fixes worth trying.

Step 1 – Open Phone dialer

Step 2 – Dial exactly: *#*#86583#*#*

If the code works, you will see "VoLTE carrier check was disabled" or "VoLTE carrier check is disabled".

Step 3 – Restart your phone

Step 4 – Check VoLTE toggle: Settings → SIM cards & mobile networks → [Your carrier] SIM → VoLTE should now appear.

Note: This code does not work on all HyperOS versions or all Xiaomi models. If nothing happens, your device doesn't support this code – proceed to Fix 2.

Fix 2 – Check Carrier Provisioning

Even if your phone supports VoLTE, your carrier may not have provisioned VoLTE correctly on your account or SIM profile.

Call your carrier (EE: 150, O2: 202, Vodafone: 191, Three: 333) and ask: "Please check if VoLTE is provisioned correctly on my account and send a new SIM profile." Restart your phone after they confirm.

Fix 3 – Check Preferred Network Type

VoLTE only works when your phone is on 4G or 5G.

Navigation: Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → Select 5G/4G/3G auto or 4G/3G/2G auto (not "3G only" or "2G only").

Fix 4 – Check IMS Registration (Advanced)

This tells you whether your phone is actually registered for VoLTE on your carrier's network.

Step 1 – Dial *#*#4636#*#* → Phone information

Step 2 – Look for:

  • "VoLTE provisioned" – if "false", your carrier hasn't provisioned VoLTE correctly. Call them (Fix 2).
  • "IMS registered" – if "false", your phone isn't connected to VoLTE services. Toggle Airplane mode or restart.
  • If both are "true" but calls still drop to 3G: The issue is on your carrier's side – call them.

Fix 5 – Reset Network Settings (Last Resort)

⚠️ Removes saved Wi-Fi passwords and paired Bluetooth devices. Does not delete photos or contacts.

Path: Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth

Only do this if Fixes 1-4 didn't work. This rarely fixes VoLTE issues but is worth trying as a last step.

Quick Questions

Why is the VoLTE toggle missing on my Xiaomi?
Xiaomi hides VoLTE for some carriers by default. Dial *#*#86583#*#* to disable the carrier check on many devices, then restart.

Does the code *#*#86583#*#* work on all Xiaomi phones?
No. It works on many but not all Xiaomi, Redmi and POCO devices. If nothing happens, your device doesn't support this code – check carrier provisioning instead.

Does EE support VoLTE on Xiaomi?
Yes, EE supports VoLTE on many recent UK Xiaomi models. Call 150 to check if it's correctly provisioned on your account.

Why does my call drop from 4G to 3G?
This means VoLTE is not working. Check carrier provisioning (Fix 2) and ensure your preferred network type is set to 5G/4G/3G auto.

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

Xiaomi Cannot Enable VoLTE in the UK

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