Ooooh I'd love to know this too. We live in Washington DC, and currently have an 11 Pro and 11 on AT&T, and the cell coverage in our house is absolutely terrible: no data/cell connections often, going to about 1.5 Mbps down when we're lucky. My XS last year did the same thing, and I even had the thing replaced at one point (so we know it's not the individual phones). In other areas of DC the connection is wonderful. It's just our particular house/neighborhood that's awful.