I live in a small town next to a big wide open space, and my AT&T reception is rotten. When we first moved in, we got an AT&T Microcell, and never have a problem with our phones. Thanks to construction work in the house, I'm having the opportunity to compare WiFi Calling to Microcell. Microcell is better. Much better. Under WiFi Calling, I have a solid WiFi signal (via Apple Airport Extreme), but phone calls are dropped, one side of the conversation is frequently lost, and incoming calls are missed. Never happens when the Microcell is plugged in.