A couple of hours ago, I drove, with Sensorly, to the 4G-complete Homestead tower at SW 104 ave and 248 street.
As I went east on 248 street, no sign of 4G, even as I'm almost right at the tower. So, I did the airplane mode on-off thing, and that did the trick. I continued east on 248 st until I reached 97 ave, made a U-turn and drove to 112 ave. Turned north until 4G disappeared around 220 street. Turned around and tried to recapture 4G.
4G never came back. I lost count of how many times I went in and out of airplane mode, even as I was right by the tower. Not sure how to interpret that. Too bad, as I really wanted to explore that area.