I haven't had a dropped call on WiFi-C yet and I use to get them frequently when using the Mcell in my home. I suppose that one could simply leave WiFi-C on and let the iPhone switch to the Mcell while at home but honestly, I've found WiFi-C to be a more stable connection than the Mcell in my home. Currently, the only way to avoid this is to put the WiFi-C capable phones in Airplane Mode while at home. People who have mixed (WiFi-C and Mcell) environments because not all of their phones are WiFi-C capable, are in a real pickle as the strong Mcell signal strength will override WiFi-C and the iPhone will switch to the Mcell. I have an adequate WiFi signal on those upper floors of my house where I also get an adequate cell tower signal but if I start a WiFi-C call downstairs and happen to wander upstairs where the cell tower signal improves to a point where switching occurs, my call is suppose to drop as per AT&T's FAQs page. This hasn't happened yet but I can imagine that in certain circumstances it will. Some spots on the top levels of my house get a LTE signal of 2 - 3 bars (dots) and this is a strong enough tower signal to cause my iPhone to switch to the tower and drop the call. I want to be able to force the iPhone 6 to maintain the Wifi-C call even if it senses that there is a cell tower with an adequate signal strength to switch to. I'm really not worried about this outside of my home as I am while at home, as I am currently outside of a HD Voice service area. Outside of a HD Voice service area, there is no handoff and the call is dropped. Handoffs from WiFi-C to LTE are suppose to be seamless when in a HD Voice service area.
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