However, on at least six occasions during my tests, the new iPhone was either reporting “no service” or searching for a network while the old one, held in my other hand, was showing at least a couple of bars. Neither Apple nor AT&T could explain this. The iPhone 4 quickly recovered in these situations, showing service after a few seconds, but it was still troubling.

New iPhone Keeps Apple Top of Class – WSJ.com

i’m still going to get the new iphone but this line from Mossberg is a heartbreaker.