2 Real world experience between Verizon and AT&T.

A buddy (BB-verizon) and I (iPhone-at&t) climbed 4 Peaks about 40 miles north of Phoenix a couple weeks ago, it takes almost an hour of forest service road to get to the trailhead.

When we got to the top we pulled out our phones and he had service I did not. I made a call to my wife to tell her I was behind schedule.

Same two guys, same two phones in the grand canyon in October. At the 1.5 mile resthouse, (1.5 miles down into the canyon)he had service on verizon and I did not. He made a call and I sent a text.

So Verizon in this area kills AT&T on coverage.