What to Do If Wi-Fi Calling Isn’t Working on Xiaomi 15 Ultra

Wi-Fi Calling is supposed to keep your calls clear when cellular signal is weak.
When it stops working on the Xiaomi 15 Ultra, calls may fail indoors or sound distorted.
This usually comes down to network settings, carrier requirements, or a feature that is turned off without you noticing.

Why Wi-Fi Calling Isn’t Working on Your Xiaomi 15 Ultra

• Wi-Fi Calling is disabled in phone settings.
• Your carrier does not support Wi-Fi Calling on your plan.
• Emergency address information is missing or incomplete.
• Wi-Fi network is unstable or restricted.
• Software settings did not apply correctly after an update.

1. Make Sure Wi-Fi Calling Is Turned On

Wi-Fi Calling must be enabled manually, even if your carrier supports it.
If the feature is off, your phone will always rely on cellular signal instead of Wi-Fi.

1. Open Settings, and then tap SIM cards and mobile networks.
2. Tap your active SIM, and then enable Wi-Fi Calling.

2. Confirm Your Carrier Supports Wi-Fi Calling

Not all carriers support Wi-Fi Calling on every device or plan.
If your carrier blocks the feature, it will not work no matter how strong your Wi-Fi is.

1. Open Settings, and then tap SIM cards and mobile networks.
2. Tap your SIM details, and then check Wi-Fi Calling availability or carrier info.

3. Check Your Emergency Address Information

Most carriers require a registered emergency address for Wi-Fi Calling.
If this information is missing, calls may not go through.

1. Open Settings, and then tap SIM cards and mobile networks.
2. Tap Wi-Fi Calling, and then review or update emergency address details.

4. Switch Wi-Fi Networks

Some Wi-Fi networks block calling services, especially public or office networks.
Switching networks helps determine if the issue is network related.

1. Open Settings, and then tap Wi-Fi.
2. Connect to a different Wi-Fi network, and then test Wi-Fi Calling again.

5. Restart Wi-Fi and Mobile Connections

Temporary network conflicts can stop Wi-Fi Calling from registering correctly.
Refreshing both connections often restores the feature instantly.

1. Open Settings, and then tap Wi-Fi.
2. Turn Wi-Fi off and on, and then toggle Mobile data off and back on.

6. Restart Your Phone

A restart reloads network services and clears minor system glitches.
This is one of the simplest fixes when Wi-Fi Calling suddenly stops working.

1. Swipe down from the top to open Quick Settings, and then tap the Power icon.
2. Tap Restart, and then wait for the phone to fully boot up.

Wi-Fi Calling on the Xiaomi 15 Ultra usually works reliably once it is properly set up.
After confirming carrier support and refreshing your network settings, calls should go through clearly even without strong cellular signal.

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