I am thinking of either upgrading to iPhone 4S, or to get another iPhone 4S from Verizon (currently I am using AT&T).
Is it said that Verizon's reception in general is slightly better than AT&T? Or does it depend largely on the location?
(The area I use is Bay Area San Francisco. It was somewhat inconvenient before that when I was using iPhone 4 in subway (Bart), I can receive phone calls or data only about during 10% to 15% of the trip if the ride is from Millbrae to San Francisco (a 35 minute ride), and heard that Verizon might work better.)