Xiaomi WiFi Calling Not Working on Vodafone Germany

Xiaomi WiFi Calling Not Working on Vodafone Germany (2026 Fix)

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 Vodafone Germany, this guide covers common troubleshooting steps.

Before You Start – Quick Checks

  • Check your plan – WiFi Calling (VoWiFi) is not available on all Vodafone plans. CallYa Prepaid has supported it since March 2023, but some older or discounter plans may not include it.
  • Test another Wi-Fi network – If possible, try a different private Wi-Fi network to determine whether the problem is network-specific.
  • 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.
  • Does it work on some Wi-Fi networks but not others? – This typically indicates a network restriction issue.
  • 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 is not available on all Vodafone tariffs. Some prepaid and MVNO plans do not support it.
  • Wi-Fi network restrictions – Some Wi-Fi networks block the ports required for WiFi Calling (UDP 500 and 4500).
  • VPN or custom DNS – VPNs, custom DNS, or location-masking configurations can interfere with WiFi Calling in some cases.
  • Carrier provisioning – Even if your plan supports WiFi Calling, it may need to be activated on Vodafone's side.
  • Software or configuration issues – Incorrect network settings or outdated system software can prevent WiFi Calling from working.

Check Plan & Carrier Support

Before troubleshooting your device, verify that your Vodafone plan supports WiFi Calling:

  • Vodafone CallYa Prepaid – Supports WiFi Calling since March 2023.
  • Vodafone Postpaid (contract) plans – Generally support WiFi Calling.
  • Vodafone MVNOs – Support varies. Otelo supports it, but some older resellers like Fyve may not.

Important: Tariff Check

  • If your tariff is not eligible for WiFi Calling, enabling the setting may not activate the service.
  • Contact Vodafone directly to confirm whether your specific tariff includes WiFi Calling.

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 Vodafone SIM into another phone that supports WiFi Calling
  • Check if WiFi Calling works on the other phone
  • 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, the problem is more likely related to your SIM, plan, or carrier provisioning – contact Vodafone

If the SIM works normally in another phone, continue with Step 1.

Step 1: 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 Vodafone SIM
  • Toggle Wi-Fi calling or Make calls using Wi-Fi ON

If the option is not visible:

  • Some Xiaomi models may require you to connect to a Wi-Fi network first before the option appears.
  • Check Settings → Additional settings → Wi-Fi calling.

If WiFi Calling is enabled but still not working, move to Step 2.

Step 2: Test Another Wi-Fi Network

Why this matters: Some Wi-Fi networks block the traffic required for WiFi Calling. Testing on a different network helps identify whether the issue is network-specific.

  • Connect to a different private Wi-Fi network – If possible, test on a home or office network instead of public/hotel Wi-Fi.
  • Test WiFi Calling on the second network – If it works, the problem is likely with the original Wi-Fi network, not your device or plan.
  • If WiFi Calling doesn't work on any network – Continue with the steps below.

If WiFi Calling still doesn't work on another network, move to Step 3.

Step 3: Disable VPN / Custom DNS

Why this matters: VPNs, custom DNS, or location-masking configurations can interfere with WiFi Calling in some cases.

  • Disable VPNs – Any active VPN connection may interfere with WiFi Calling.
  • Check your DNS settings – If you are using custom DNS (e.g., Cloudflare 1.1.1.1, Google 8.8.8.8), try switching to your ISP's default DNS.
  • Set DNS to automatic – Go to Wi-Fi settings → Modify network → Advanced → DHCP → DNS 1 and DNS 2 → Set to automatic or blank.

If WiFi Calling still doesn't work, move to Step 4.

Step 4: Check Xiaomi's Hidden VoWiFi Toggle

Why this matters: Xiaomi devices have a hidden diagnostic code that can toggle VoWiFi functionality. This is a Xiaomi-specific diagnostic toggle, not a Vodafone activation code.

  1. Open the Phone app
  2. Dial *#*#869434#*#*
  3. This may enable or disable the VoWiFi function on supported Xiaomi devices
  4. Restart your phone and check 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 5.

If WiFi Calling still doesn't work, move to Step 5.

Step 5: 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

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

Step 6: Check for System Updates

Why this matters: Software updates often include modem firmware improvements that can enable or improve 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 Vodafone or Xiaomi support.

Contact Carrier (When Required)

Contact Vodafone Germany 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

Vodafone Support (Germany)

  • Vodafone Help Centre: vodafone.de/hilfe
  • Vodafone App: MeinVodafone (available on Google Play Store)

Contact Xiaomi EU 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 EU Support

Final Verdict

If your Xiaomi won't connect to WiFi Calling on Vodafone Germany, start by checking that your plan actually supports the feature – not all Vodafone tariffs include WiFi Calling, and even if the settings option appears, it may have no effect on unsupported plans. If your plan supports it, test your SIM in another phone to determine if the issue is device-specific. On the device side, ensure WiFi Calling is enabled in Settings, then test on a different private Wi-Fi network to rule out network restrictions. If the issue persists, disable any VPNs or custom DNS configurations that may interfere with the service. You can also try the Xiaomi diagnostic code *#*#869434#*#* as a toggle, or reset network settings. Contact Vodafone to verify your account provisioning if none of these steps resolve the problem.

Frequently Asked Questions

Does Vodafone Germany support WiFi Calling on Prepaid?

Yes, Vodafone CallYa Prepaid has supported WiFi Calling since March 2023. However, some Vodafone MVNOs and older prepaid plans may not include it.

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. Try connecting to a Wi-Fi network first, as the option sometimes only appears when Wi-Fi is active.

What is the activation code for VoWiFi on Xiaomi?

Dial *#*#869434#*#* in the Phone app to toggle VoWiFi on supported Xiaomi devices. This is a Xiaomi-specific diagnostic toggle, not a carrier activation code.

Why does WiFi Calling stop working after a few hours?

This can have several possible causes, including network registration or configuration issues. Restarting your device or resetting network settings may temporarily resolve it.

Does using a VPN affect WiFi Calling?

VPNs, custom DNS, or location-masking configurations can interfere with WiFi Calling in some cases. Try disabling VPNs and setting DNS to automatic as a diagnostic test.

Why does WiFi Calling work on one network but not another?

Some Wi-Fi networks restrict the traffic required for WiFi Calling, particularly public hotspots, hotel Wi-Fi, or networks with captive portals. Test on a different private Wi-Fi network to determine if the issue is network-specific.

Do these fixes work on EU Xiaomi devices?

The general troubleshooting steps apply to Xiaomi, Redmi and POCO phones in Germany and the EU, although menu names and available options can vary by model and software version.

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

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