I have an iPhone 6 16gb for Verizon and I don't see the option for Wifi Calling, im a post paid shared data plan. Any ideas?
What version of iOS do you have installed (9.3 or later)? Where have you checked (under Settings > Phone)?
That's odd. And HD/Advanced Calling is enabled as a feature (on Verizon's side of things) for the line in question?
Try rebooting/resetting network settings/restoring if necessary? Maybe VoLTE has to be enabled? Go to Settings>Cellular>Cellular Data Options>Enable LTE> Voice & Data Do this as well.