Nine days and counting until the Apple iPhone 3G goes on sale in the U.S… Many plan on buying their first iPhone, while existing iPhone users ponder whether to upgrade to the new phone or not. Rumors and speculation abound as to how much AT&T will charge for its service plans and what features will come with those plans. We’ve taken it upon ourselves to address some of the rumors and issues below…1) Rumor: AT&T will charge iPhone 3G customers more than it charges other AT&T non-iPhone customers.False: