Bulldog, there is somehow partial cell coverage that reaches Whitney's summit. After taking my iphone up the trail last year and getting ZERO bars or signal on either 3G or Edge network, I decided to leave the brick in the truck this go around. To my surprise, I make it to the top and there is this group of four calling family and friends. The man in charge of the phone allowed me to make a call to my wife from the summit... I talked for two minutes with no issues. Perfect signal. Dont ask me how.