Wifi calling on iOS9 with iPhone 5s and ATT
I cannot enable Wifi calling on my iPhone 5s after upgrading to iOS9. My carrier is ATT. According to Apple's instructions, you go to Settings-Phone-Wifi calling. I do not have a "Wifi Calling" choice under Settings-Phone. Could it be hiding somewhere else? Or is there some way to make it appear?
Thanks
iPhone 5s