how to set up iphone 6 for wi fi calling

Contact your carrier and ask if they can offer you this service.

Take a look at this list: Wireless carrier support and features for iPhone in the United States and Canada - Apple Support

Then read this support guide:

Make a call with Wi-Fi Calling - Apple Support

Regards

Giulio

Hi

Go to settings down to carrier then go to second phone icon click that check wifi calling if it,s Not there contact your network provider.

Cheers

Brian 🇬-1F1E7;