Wi-Fi calling not working!!!!

You guys are misunderstanding me. Wi-Fi calling is still not working on my one device. The other device on the red plan works, but I can only receive incoming calls up to 36 hours when coming from a cell coverage area into an area where there is no coverage. After this I can only make calls and send and receive sms’s. Wi-Fi calling meaning you are using your existing cell number to make and receive calls normal calls through a Wi-Fi network instead of through 3G, 4G or 5G irrespective whether or not you have cell phone coverage. It seems only the red plans allow you to do such calling. I am not taking about Skype, WhatsApp, Messenger and other social media platforms to make and receive calls through a Wi-Fi network.