I've experienced a "dead space" of sorts near Pirates. I was sitting at Riverbelle out on the terrace, leaned closer to Pirates and my signal went POOF. Called hubby back and took a few steps the other way and it was just fine. This was with T-mobile, with a cell that did not have roaming capability.
My current cell phone is with Sprint, it goes on roaming anytime we are in a ride. No signal at all inside Soarin but that is to be expected.