Is it possible for the provider of a WiFi signal to restrict a phone from connecting for WiFi calling? I've connected to WiFi calling successfully at home and a few other places. At work I have spotty T-mobile coverage in the building, but we have guest WiFi that anyone can connect to. I'm connected fine to the WiFi, but I'm not getting the "T-mobile WiFi" indicator and when I go to an area where there is no cell signal I lose all phone/SMS capability. Could my workplace be blocking access? I was really hoping WiFi calling could be the answer to my spotty coverage at work. I have been able to use VOIP apps just fine (i.e. Google Hangouts, Vonage, etc) so it doesn't seem like they're blocking VOIP specifically...just WiFi calling for some reason.