Xiaomi WiFi Calling Not Working on TDC Denmark

Xiaomi WiFi Calling Not Working on TDC Denmark (2026 Fix)

📌 Quick Answer – If Your Xiaomi WiFi Calling Isn't Working on TDC:

  • ✓ Enable WiFi Calling in Settings – Go to Settings → SIM cards & mobile networks → Your TDC SIM → Wi-Fi calling.
  • ✓ Test the same SIM in another compatible phone – This determines if the issue is your Xiaomi device or your SIM/plan.
  • ✓ Test a different Wi-Fi network – Public or restricted Wi-Fi can block WiFi Calling.
  • ✓ If the setting is missing, your plan or device may not support WiFi Calling on your specific provider.
  • ✓ Try the Xiaomi diagnostic code – On some devices, dialing *#*#869434#*#* may toggle the device-side VoWiFi carrier check. It cannot add carrier support or activate the service on your account.
  • ✓ Check IMS registration – If available, check if Voice over Wi-Fi shows as Available or Registered.

If WiFi Calling still doesn't work, follow the step-by-step guide below.

If your Xiaomi, Redmi, or POCO phone won't make or receive calls over Wi-Fi, the WiFi Calling icon doesn't appear, or calls drop when switching to Wi-Fi on a Danish provider using the TDC NET mobile network, this guide covers common troubleshooting steps. This feature is also known as VoWiFi.

Before You Start – Quick Checks

  • Check your plan – WiFi Calling may not be available on all plans. Contact your provider directly to confirm your subscription supports it.
  • Ensure Wi-Fi is stable – Some public, hotel, workplace, or captive-portal Wi-Fi networks may interfere with WiFi Calling. Test a different private Wi-Fi network to rule this out.
  • Toggle Airplane Mode – Turn on for 30 seconds, then off to refresh network registration.
  • Restart your phone – Clears temporary software glitches.

If these quick checks don't work, continue with the step-by-step guide below.

Quick Navigation

Diagnose the Issue First

Before making changes, determine the pattern of your WiFi Calling issue:

  • Is the option visible but not working? – The toggle is available, but calls still use the mobile network.
  • Is the option missing entirely? – The WiFi Calling setting does not appear in your SIM settings.
  • Does it work intermittently? – WiFi Calling works sometimes but disables itself after a few hours.
  • Do calls drop when switching between Wi-Fi and mobile? – If calls drop specifically when moving between Wi-Fi and mobile coverage, the problem may involve handover rather than basic WiFi Calling activation.
  • Test your SIM in another WiFi-Calling capable phone – This is the quickest way to identify if the issue is your Xiaomi device, your SIM, or your plan.

Why This Happens

  • Plan or carrier restrictions – WiFi Calling may not be available on all plans from your provider.
  • IMS registration failure – WiFi Calling depends on IMS registration. If IMS registration fails, WiFi Calling may not work even when the setting is enabled.
  • Xiaomi carrier configuration – Some Xiaomi firmware versions or regional variants may restrict carrier-specific WiFi Calling features. Devices with China ROM may not show the option even if the hardware supports it.
  • Wi-Fi network restrictions – Some Wi-Fi networks block the traffic required for WiFi Calling.
  • Software or configuration issues – Incorrect network settings or outdated system software can prevent WiFi Calling from working.

Quick Diagnostic Table

  • WiFi Calling option missing → Plan support, SIM provisioning, ROM variant, or Xiaomi carrier configuration
  • Option visible but not working → IMS registration, Wi-Fi network, software, or carrier configuration
  • Works on other phones but not Xiaomi → Xiaomi-specific configuration, ROM, or carrier settings
  • Works intermittently → IMS registration, network handover, or Wi-Fi stability
  • Works on one Wi-Fi network but not another → Wi-Fi network restriction or configuration

Check Your Provider's WiFi Calling Support

Before troubleshooting your device, verify that your plan and phone are compatible:

  • Check with your provider – WiFi Calling availability depends on the specific subscription, Xiaomi model, software version, and carrier compatibility. Check with your provider to confirm whether your exact device is supported.
  • This guide is for customers with a subscription on a Danish provider using the TDC NET mobile network. If your provider uses the TDC network but your subscription is with another brand, WiFi Calling availability may depend on that provider's policies and provisioning.

Important: Carrier Check

  • If WiFi Calling is not provisioned on your account, the feature may not work even if the option is visible on the phone.
  • Contact your provider directly to confirm whether your specific subscription and device are supported.

Step 1: Test SIM in Another Phone

Why this matters: This is the quickest way to determine if the issue is your Xiaomi device or your SIM/plan.

  • Insert your SIM into another phone that supports WiFi Calling
  • Check if WiFi Calling works on the other phone using the same Wi-Fi network
  • If WiFi Calling works normally on the other phone, the issue is more likely related to your Xiaomi device or its configuration – continue with the steps below
  • If WiFi Calling also doesn't work on the other phone using the same Wi-Fi network, test the SIM on a different Wi-Fi network to further isolate carrier vs. network issues
  • If the issue persists, contact your provider to check SIM/plan provisioning

Step 2: Test Another Wi-Fi Network

Why this matters: WiFi Calling can be blocked by specific Wi-Fi networks. Testing on a different network helps isolate whether the issue is network-specific.

  • Connect to a different private Wi-Fi network (e.g., home or office).
  • Test WiFi Calling on the second network.
  • If it works, the original Wi-Fi network is the likely cause.
  • If it doesn't work on any network, continue with the steps below.

Step 3: Enable WiFi Calling in Settings

Why this matters: WiFi Calling must be explicitly enabled on your Xiaomi device.

  • Settings → SIM cards & mobile networks
  • Tap your SIM
  • Look for Wi-Fi calling, Make calls using Wi-Fi, or VoWiFi and toggle it ON

If the option is not visible:

  • Use the search function in Settings and search for "WiFi Calling", "VoWiFi", or "Make calls using WLAN". Wording may vary by model and software version.
  • Check Settings → Additional settings → Wi-Fi calling.

If WiFi Calling is enabled but still not working, move to Step 4.

Step 4: Check Your Xiaomi ROM and Regional Variant

Why this matters: This is one of the most important steps for Xiaomi users. WiFi Calling availability can vary significantly depending on the exact model, ROM version, and regional variant of your Xiaomi device.

  • Global/EU ROM – These generally have better carrier compatibility with European networks. They are more likely to support VoWiFi on Danish carriers.
  • China ROM – May lack carrier-specific features or profiles for European networks, even when the hardware supports VoWiFi. The WiFi Calling option may be hidden or may not function correctly.
  • Imported variants – Models from other regions (e.g., India, China) may have different carrier configurations, modem firmware, and feature support. Check the exact model and ROM version.
  • If you are using a non-European ROM or an imported device, carrier-specific features like WiFi Calling are more likely to be incompatible or unavailable.

If you are using a European/Global variant and WiFi Calling still doesn't work, move to Step 5.

Step 5: Check Xiaomi's VoWiFi Diagnostic Toggle

Why this matters: On some Xiaomi devices, dialing a diagnostic code can change a device-side VoWiFi carrier check. It may make the WiFi Calling option appear if the device previously hid it, but it cannot add carrier support or activate the service on your account.

  1. Open the Phone app
  2. Dial *#*#869434#*#*
  3. On supported Xiaomi devices, this may toggle the VoWiFi carrier check.
  4. After dialing, check the WiFi Calling setting again in the SIM settings menu.
  5. Restart your phone and test if WiFi Calling works.

Note: This code may not work on all Xiaomi devices or ROM versions. If it doesn't work, proceed to Step 6.

If WiFi Calling still doesn't work, move to Step 6.

Step 6: Check IMS Registration (If Available)

Why this matters: WiFi Calling depends on IMS registration. If IMS registration fails, WiFi Calling may not work even when the setting is enabled. Some Xiaomi models expose additional IMS information through Android's testing menu, but the available options vary significantly by model and software version.

If your device provides an IMS status option after opening the Android testing menu, you can use it as an additional diagnostic check:

  1. Open the Phone app
  2. Dial *#*#4636#*#*
  3. Select Phone information
  4. Look for an IMS or service status section if one is available.
  5. Check whether IMS and WiFi Calling-related services are registered or available. The wording and menu layout vary significantly by device and software version.

If IMS shows "Not Registered":

  • Try toggling Airplane Mode on and off to re-register
  • Try toggling WiFi Calling off and on in Settings
  • If IMS registration is unavailable or fails consistently, carrier provisioning becomes one of the things to check.

Note: The exact menu and available IMS information vary by model and HyperOS/MIUI version. This menu is not available on every Xiaomi device.

If WiFi Calling still doesn't work, move to Step 7.

Step 7: Check Other IMS Calling Services

Why this matters: WiFi Calling is often provisioned alongside other IMS-based voice services. If VoLTE/4G Calling is also unavailable, this can indicate a broader IMS provisioning, carrier compatibility, or device configuration issue.

  • Settings → SIM cards & mobile networks
  • Tap your SIM
  • Look for VoLTE, 4G calling, or Use VoLTE and toggle it ON

If VoLTE is not visible or cannot be enabled:

  • This may indicate a plan or device compatibility issue
  • Contact your provider to confirm your plan supports 4G calling

If VoLTE is enabled but WiFi Calling still doesn't work, move to Step 8.

Step 8: Reset Network Settings

Why this matters: This resets Wi-Fi, mobile data, and Bluetooth settings without deleting personal data. It clears corrupted network configurations that may be preventing WiFi Calling.

  1. Settings → Connection & sharing (HyperOS) or Settings → Additional settings → Backup & reset (MIUI)
  2. Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
  3. Confirm the reset
  4. Restart your phone
  5. Re-enable WiFi Calling in Settings
  6. Test if WiFi Calling works

Note: You will need to reconnect to saved Wi-Fi networks after performing this reset.

If WiFi Calling still doesn't work, move to Step 9.

Step 9: Check for System Updates

Why this matters: System updates can include carrier configuration, modem, and connectivity fixes that may affect WiFi Calling.

  1. Settings → About phone → Check for updates
  2. Install any available updates
  3. Restart your phone and check if WiFi Calling works

If you're already on the latest version and WiFi Calling still doesn't work, contact your provider or Xiaomi support.

Decision Box – What to Do Next?

Still not working? Let's narrow it down:

  • ✓ SIM has no WiFi Calling in another phone? → Contact your provider (plan or provisioning issue).
  • ✓ SIM works elsewhere but not on your Xiaomi? → The problem is likely related to Xiaomi compatibility, firmware, carrier configuration, or device settings (continue troubleshooting above).
  • ✓ WiFi Calling option is missing? → Check plan support, ROM version, or try the hidden diagnostic toggle (Step 5).
  • ✓ WiFi Calling works intermittently? → Check IMS registration (Step 6) and try another Wi-Fi network.
  • ✓ Calls drop when switching between Wi-Fi and mobile? → This may involve handover rather than basic activation; check IMS registration and contact your provider.
  • ✓ Nothing works? → Contact your provider to check account provisioning and device compatibility.

Contact Your Provider (When Required)

Contact your Danish provider if:

  • Your SIM has no WiFi Calling in other phones as well (plan or provisioning issue).
  • You've tried all steps above and WiFi Calling still doesn't work.
  • You need to verify that your plan includes WiFi Calling.
  • You need to check that your SIM and account are properly provisioned for WiFi Calling.

Your Provider's Support

  • Check your provider's official website for support contact details.
  • Check your provider's app for help and troubleshooting.

Contact Xiaomi Support if:

  • You've tried all steps above and WiFi Calling still doesn't work.
  • You've tested your SIM in another phone and it works normally.
  • You suspect a software or hardware issue with your device.

Xiaomi Support

Final Verdict

If your Xiaomi won't connect to WiFi Calling on your Danish provider, follow this diagnostic flow:

  1. Confirm subscription and device eligibility. – Check with your provider that your plan includes WiFi Calling and that your Xiaomi model is supported.
  2. Test the same SIM on another compatible phone. – This isolates SIM/plan issues.
  3. Test a different Wi-Fi network. – This isolates Wi-Fi-specific issues.
  4. Check the WiFi Calling setting. – Enable it in SIM settings.
  5. If the option is missing, check the Xiaomi ROM and regional variant (Step 4).
  6. If the ROM is non-European, carrier-specific features like WiFi Calling are more likely to be incompatible.
  7. Try the Xiaomi diagnostic toggle. – *#*#869434#*#* may change the device-side VoWiFi carrier check.
  8. Check IMS status if available. – This can help diagnose registration.
  9. Check other IMS services. – If VoLTE is also unavailable, this points to a broader provisioning or compatibility issue.
  10. Reset network settings. – As a last-resort device configuration step.
  11. Update the phone. – May contain modem or carrier fixes.
  12. Contact the provider. – If none of these steps resolve the problem, contact your provider to verify account provisioning and device compatibility.

Frequently Asked Questions

Does my Danish provider support WiFi Calling on Xiaomi?

WiFi Calling availability depends on the specific subscription, Xiaomi model, software version, and carrier compatibility. Check with your provider to confirm whether your exact device is supported.

Why can't I find the WiFi Calling option on my Xiaomi?

If the option is missing, your plan may not support WiFi Calling, or your device may not have the feature enabled. Use the search function in Settings for "WiFi Calling", "VoWiFi", or "Make calls using WLAN". You can also try the hidden diagnostic toggle *#*#869434#*#*.

What is the Xiaomi VoWiFi diagnostic code?

*#*#869434#*#* toggles VoWiFi-related functionality on supported Xiaomi devices. It is a device-side diagnostic toggle, not a carrier activation or account-provisioning code. It cannot add carrier support or activate the service on your account.

Why does WiFi Calling stop working after a few hours?

Intermittent WiFi Calling can be related to IMS registration, the Wi-Fi network, device software, or handover between Wi-Fi and mobile networks. Test another Wi-Fi network first. If the problem follows the SIM across compatible phones, contact your provider to check provisioning.

How do I check IMS status on Xiaomi?

If available, dial *#*#4636#*#* in the Phone app, select Phone information, and look for an IMS or service status section. The exact menu and available IMS information vary by model and software version.

What is the difference between WiFi Calling and VoWiFi?

WiFi Calling and VoWiFi (Voice over Wi-Fi) refer to the same feature – making calls over a Wi-Fi network instead of the mobile network.

If my provider uses the TDC NET network but isn't TDC-branded, will WiFi Calling work?

WiFi Calling availability may depend on your specific provider and plan, not just the underlying network. Check with your provider directly for WiFi Calling support on your subscription.

Does a China ROM Xiaomi work with WiFi Calling on Danish networks?

China ROM devices often lack carrier-specific features or profiles for European networks. Even when the hardware supports VoWiFi, the option may be hidden or may not function correctly. If you are using a non-European ROM or an imported device, carrier-specific features like WiFi Calling are more likely to be incompatible or unavailable.

Note: This guide is updated for 2026. Menu names may vary slightly between HyperOS and MIUI versions. WiFi Calling availability depends on your specific plan and device model.

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