How do I make Wifi Calling the default on my iPhone 10s?

On all of my devices Wi-Fi calling is always the default. It will only fall back to cellular if the Wi-Fi signal is too weak. And if I move around at home it will switch seamlessly between the two while on a call. It should be the default on yours, also, unless your Wi-Fi signal is very weak or slow. Indeed, there is no way to make cellular calling the default without turning off Wi-Fi calling. Go to Settings/Cellular. I’m assuming your have Wi-Fi calling on and Personal Hotspot off (if it is on that precludes use of Wi-Fi calling, because it uses the same Wi-Fi circuit as Wi-Fi calling). Also, scroll to the bottom and turn off Wi-Fi assist, which really shouldn’t matter unless your Wi-Fi signal is weak or drops out periodically, but it won’t hurt to try with it off.

KarenJN,

I understand your your issue with the cell signal being strong enough that the phone will go with that instead of Wi-Fi. I frequently have difficulties with a cell signal not being strong enough in my house for a reliable call. While you can select to make a Wi-Fi call, as explained in the referenced article, there isn't a setting to make Wi-Fi calling the default selection.

Cheers.

Hello KarenJN,

Thank you for using Apple Support Communities.

I understand that you want to use Wi-Fi calling over cellular. I would recommend taking a look at the following support article to make a call with Wi-Fi:

Make a call with Wi-Fi Calling - Apple Support

Best regards.