Wi-Fi calling on iPhone works as a great alternative for making and receiving phone calls in areas with poor cellular connectivity. However, a number of reasons — such as software-related glitches, incorrectly configured settings, and network-related issues — can prevent Wi-Fi calling from working.
So, if Wi-Fi isn’t working for you when the cellular signal seems weak or unavailable, the list of solutions below should fix that.
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Enable Wi-Fi Calling on iPhone
If you’ve just finished setting up your new iPhone and haven’t been able to get Wi-Fi Calling to work, you’ll need to confirm that it’s working in iOS. To do that, open Setting application and select Mobile. Then tap Call over Wi-Fi and turn on the switch next to it Call over Wi-Fi on this iPhone (if disabled).

Note: If Wi-Fi Calling isn’t available in your iPhone’s Cellular settings, check Apple’s wireless carrier support and features page to confirm that your carrier supports it. this function.
Enable Wi-Fi calling for other devices
Your mobile carrier may also allow any iOS or macOS device where you’re signed in with the same Apple ID as your iPhone to make calls over Wi-Fi. If you can’t do that, you probably haven’t activated the relevant settings.
On iPhone, go to Setting > Mobile > Call over Wi-Fi and turn on the switch next to it Add Wi-Fi calling for other devices.

Then, going back to the previous screen, tap Calls on other devices and toggle the switch next to each Apple device on which you want the feature to work.
Restart iPhone
Try restarting your iPhone. That often helps with minor issues that prevent features like Wi-Fi Calling from working properly. However, since iOS doesn’t have a direct option to restart the device, you must manually turn it off before turning it back on.
To do this, visit Setting > Shared > Turn off and slide Power icon to power off your iPhone. Then press and hold Edge to restart it.

Eject and reinsert the SIM
If your carrier supports Wi-Fi calling but you can’t see an option to enable it, try removing and re-inserting the SIM in your iPhone. That usually works as a quick fix to make it visible.
Use the SIM eject tool or a bent paper clip to remove the iPhone’s SIM tray. Then, restart the device before re-inserting it.

Update carrier settings
Your service provider periodically releases updates that address bugs and introduce new features. iOS automatically installs them. But if it hasn’t applied the latest update yet, you can install it yourself.
To do that, visit Setting > Shared > About and wait up to one minute. If you receive a Update carrier settings prompt to request an available update, tap Update.

Updating iOS can quickly fix Wi-Fi Calling related problems caused by system software that repeats many errors. So let’s go to Setting > Shared > Software updates and choose Download and install to speed up your iPhone. If iOS update appears to be stalled or failed, you can do the following to fix stuck iOS updates.

Turn off low data mode
If you have Low Data Mode enabled for your Wi-Fi connection, it may cause Wi-Fi-related functions — such as Wi-Fi Calling — to function properly. To turn it off, go to Setting > WIFI and disable Low data mode option in the Wi-Fi network of Information compartment.

Check for Wi-Fi related problems
If Wi-Fi Calling is correctly set up on your iPhone and you’ve ruled out any conflicting settings that might be preventing it from working, it’s best to check if your Wi-Fi connection is down. what’s wrong.
So let’s start by going to Setting > WIFI. If you notice an exclamation mark on top of the Wi-Fi icon or the “No Internet connection” label, that indicates a problem.

Turning Airplane Mode on and off is a quick method to fix problems with Wi-Fi on iPhone. To do that, open your iPhone’s Control Center and tap Airplane mode Icon. Follow that by tapping the same icon after a few seconds.

Alternatively, you can use Airplane mode convert in Setting app to turn Airplane Mode on and off.
Soft Reset Router
A soft reset of the router can also help fix random problems related to connection to Wi-Fi. So try doing that if it’s in an easily accessible location. If not, you may want to renew your iPhone’s Wi-Fi lease instead.

Change DNS (Domain Name Service)
Popular DNS services like Google DNS and OpenDNS can provide a better connection to your mobile account when using Wi-Fi Calling on iPhone.
To change the DNS server for your Wi-Fi connection, open Setting app and go to WIFI. Then choose Configure DNS in-network option Information stop, switch to Handmadeand enter the Google DNS or OpenDNS servers as follows:
Google’s DNS
8.8.8.8
8.8.4.4
OpenDNS
208.67.222.123
208.67.220.123

Reset Network Settings
Try performing a network settings reset on your iPhone if Wi-Fi calling isn’t working. That should fix any basic issues with both cellular and Wi-Fi. To do that, visit Setting > Shared > Reset and choose Reset Network Settings.

You must reconnect to any Wi-Fi networks after the reset procedure. Your cellular service settings will automatically update in the background.
Contact your wireless service provider
If Wi-Fi calling still doesn’t work, try contacting your wireless service provider. They should be able to help you figure out what’s wrong and offer additional suggestions that might help fix Wi-Fi Calling on your iPhone.