Xiaomi Cannot Receive Calls on Three UK

Quick Answer:
If your Xiaomi on Three UK can make outgoing calls but cannot receive incoming calls, first dial ##002# to disable call forwarding. Then check IMS registration: dial *#*#4636#*#* → Phone information. If "IMS registered" is false, call Three on 333 to enable VoLTE on your account. If IMS registered is true but calls still fail, enable VoLTE in Settings → SIM cards & mobile networks → Three SIM → VoLTE.

Diagnostic Decision Tree – Find Your Problem in 3 Steps

Instead of trying all fixes, use this decision tree to find the exact cause:

  1. Dial ##002# – If incoming calls start working immediately → problem was call forwarding.
  2. Check IMS registration (*#*#4636#*#*) – If "false", call Three (333) to enable VoLTE on your account.
  3. If IMS is true but calls still fail → Enable VoLTE on your phone (Settings → Three SIM → VoLTE).

Why This Happens – Can Make Calls But Cannot Receive (Three UK)

When your Xiaomi on Three UK can make outgoing calls but incoming calls go to voicemail or never arrive, four technical causes are most common:

  • Call forwarding active – Your Three account or phone has call forwarding enabled, sending all calls to voicemail.
  • IMS registration failure – Your phone is connected to Three's network but hasn't registered for voice services. IMS registration is required for incoming calls on 4G/5G.
  • VoLTE not provisioned on your account – Three primarily uses VoLTE for calls on 4G/5G. Without VoLTE provisioning, incoming calls may fail (though some fallback to 3G still exists).
  • SIM network registration issue – Your SIM is attached to the network but voice services are not fully registered.

Most recent UK Xiaomi models (Redmi Note 13 series, POCO F6, Xiaomi 14/15) work correctly on Three. The issue is almost always carrier provisioning or account-based, not a phone hardware fault.

Fix 1 – Disable All Call Forwarding (Most Common Cause)

Call forwarding is the #1 reason why outgoing calls work but incoming calls don't. Your phone or account may be forwarding all calls to voicemail.

Method 1 – USSD code (works on all phones): Dial ##002# and press call. This disables all call forwarding on your Three account. Wait for confirmation message.

Method 2 – Check in Phone settings: Phone app → Three dots menu → Settings → Calling accounts → Three → Call forwarding → Ensure "Always forward" is disabled.

After disabling: Ask someone to call you. If the call comes through, forwarding was the issue.

Fix 2 – Check IMS Registration (Most Important Diagnostic)

IMS registration tells you whether your phone is actually connected to Three's voice services. This should be checked before calling Three.

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

Step 2 – Look for "IMS registered"

  • If "IMS registered" is "true": Your phone is connected to Three's voice services. The issue is likely call forwarding (Fix 1) or phone settings (Fix 4).
  • If "IMS registered" is "false": Your phone is NOT connected to Three's voice services. This means Three has not provisioned VoLTE on your account. Proceed to Fix 3.

Also check "VoLTE provisioned":

  • If "false": Three has not enabled VoLTE on your account – call 333 (Fix 3).
  • If "true" but IMS is false: Network registration issue – toggle Airplane mode or restart.

Fix 3 – Check Three VoLTE Provisioning (Carrier Side)

If IMS registration is false or VoLTE provisioned is false, Three has not enabled VoLTE on your account – even if your phone supports it.

Step 1 – Call Three: Dial 333 (free from Three SIM)

Step 2 – Ask directly: "Is VoLTE enabled on my account? IMS registration shows false."

Step 3 – Request: "Please enable VoLTE on my account and send a new SIM profile."

Step 4 – After they confirm: Restart your phone, check IMS registration again (should now show "true"), and test incoming calls.

Fix 4 – Enable VoLTE on Your Xiaomi (Phone Side)

Once IMS registration is true (Fix 3 completed), enable VoLTE on your phone.

Navigation: Settings → SIM cards & mobile networks → Three SIM → VoLTE → Turn ON

If VoLTE toggle is missing: Your HyperOS build or Three SIM may not support VoLTE – call Three to check SIM compatibility.

After enabling: Restart phone and test incoming calls.

Fix 5 – Check SIM Network Registration (LTE Attach Status)

Sometimes your SIM is attached to the network but voice services are not fully registered. This is different from IMS registration.

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

Step 2 – Look for "LTE service status" or "Voice service status"

  • If "Voice service" shows "Emergency calls only" or "Out of service": Your SIM is not fully registered. Toggle Airplane mode on/off for 30 seconds.
  • If still not working: Reset network settings (Fix 6).

Fix 6 – Reset Network Settings (Last Resort)

If incoming calls still don't work after all above fixes, reset network settings.

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

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

After reset: Restart phone → Re-enable VoLTE → Check IMS registration → Test incoming calls.

Test Your SIM in Another Phone

This helps determine if the problem is your Xiaomi or your Three account/SIM.

Step 1 – Remove your Three SIM from your Xiaomi

Step 2 – Insert it into another phone

Step 3 – Ask someone to call that phone

  • If the other phone receives calls: The problem is your Xiaomi. Reset network settings (Fix 6).
  • If the other phone also cannot receive calls: The problem is your Three account or SIM. Call 333 (Fix 3).

Contact Three UK – When Required

Call Three if incoming calls still don't work after all fixes, or if IMS registration remains false:

  • Three customer service: 333 (free from Three SIM) or 0333 338 1001
  • Three community forum: community.three.co.uk – search "Xiaomi cannot receive calls"

Request them to:

  • Enable VoLTE on your account (send new SIM profile)
  • Check for any bars or restrictions on incoming calls
  • Replace your SIM if it's older than 3-4 years

Frequently Asked Questions

Why can I make calls but not receive them on Three UK?

Most commonly call forwarding is active, or IMS registration is false. Dial ##002# to disable forwarding. If that doesn't work, check IMS registration via *#*#4636#*#* – if false, call Three on 333.

What does IMS registered false mean on Three UK?

IMS registration false means your phone is connected to Three's network but not registered for voice services. This almost always means Three has not enabled VoLTE on your account. Call 333 to enable it.

Does Three UK require VoLTE for incoming calls?

Three primarily uses VoLTE for calls on 4G/5G. Some calls may fall back to 3G, but for reliable incoming calls, VoLTE should be enabled on your account. Call 333 to check.

Can a faulty SIM cause incoming call issues on Three?

Yes. Test your SIM in another phone. If the problem follows the SIM, request a replacement from Three.

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