Wi-Fi Calling is meant to keep your calls clear even when cellular signal is weak. When it stops working, calls may fail, drop, or fall back to mobile networks without warning. On the Galaxy S25 Ultra, this issue is usually tied to settings, network conditions, or carrier requirements, and most fixes are straightforward once you know where to look.
Why Wi-Fi Calling Isn’t Working on Your Galaxy S25 Ultra
- Wi-Fi Calling is disabled in phone settings.
- Your carrier does not support Wi-Fi Calling on your plan or location.
- Weak or unstable Wi-Fi connection.
- Emergency address is not set or verified.
- Software or network registration issues in OneUI 7.
1. Make Sure Wi-Fi Calling Is Enabled
Wi-Fi Calling does not activate automatically on all devices. If the feature is turned off, your phone will rely only on cellular signal even when Wi-Fi is strong.
Open Settings, and then tap Connections.
Tap Wi-Fi Calling, and then toggle it on.
Confirm any prompts that appear on the screen.
2. Check Your Emergency Address
Most carriers require an emergency address for Wi-Fi Calling to work. If this address is missing or outdated, the feature may silently fail.
Open Settings, and then tap Connections.
Tap Wi-Fi Calling and open Emergency address.
Update or confirm your address, and then save the changes.
3. Switch Wi-Fi Calling Preference
Your phone may be set to prefer mobile networks instead of Wi-Fi. Changing this option helps the device rely on Wi-Fi when signal is weak.
Open Settings, and then tap Connections.
Tap Wi-Fi Calling and select Calling preference.
Choose Wi-Fi preferred to force calls over Wi-Fi when available.
4. Test Your Wi-Fi Connection
Wi-Fi Calling needs a stable internet connection. Slow speeds, high latency, or router issues can prevent calls from connecting properly.
Open Settings, and then tap Connections.
Tap Wi-Fi and connect to a different network if possible.
Try making a call again to see if the issue improves.
5. Restart Your Phone
Restarting refreshes network registration and clears temporary communication issues. This step often restores Wi-Fi Calling without changing any settings.
Swipe down from the top right to open Quick Settings.
Tap the Power icon, and then tap Restart.
Wait for the device to boot up fully before testing Wi-Fi Calling again.
6. Contact Your Carrier
If Wi-Fi Calling still does not work, the issue may be on the carrier side. Some plans, regions, or SIM cards do not support the feature even if it appears in settings.
Use another phone or chat support, and then contact your carrier.
Ask them to verify Wi-Fi Calling support on your account and SIM card.
Follow any activation steps they provide.
Wi-Fi Calling issues on the Galaxy S25 Ultra are rarely permanent. Once the feature is enabled, properly configured, and supported by your carrier, calls should go through smoothly even without strong cellular coverage.
FAQs
Why does Wi-Fi Calling turn off by itself on my Galaxy S25 Ultra?
This can happen if the Wi-Fi connection becomes unstable or if the carrier temporarily disables the feature. Rechecking the settings usually restores it.
Can Wi-Fi Calling work without a SIM card?
No. Wi-Fi Calling still requires an active SIM card and a supported carrier plan to authenticate calls.
Does Wi-Fi Calling work while roaming?
It depends on your carrier. Some allow Wi-Fi Calling while roaming, while others restrict it based on country or network policies.
