I will tell you this is not a Samsung issue. I have Verizon and even with my old Motorola phone I could not force WiFi calling, it's the carrier. Where I live I might get one bar of 3G with Verizon depending on which way the wind blows, or maybe 1x data, but it jumps around so much it basically disables the ability to use WiFi calling since you cannot force it due to carrier restrictions. It is preferred only, but the network will ALWAYS prefer a cellular signal over WiFi for whatever reason. It is ridiculous yes, but not a Samsung or phone maker issue. I ended up getting an extender through Verizon for free because of it.
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