Verizon Wireless is distributing a guide to sales agents in a bid to retain customers tempted by an iPhone 3G, a leak claims. The sheet, labeled "3G iPhone Myths," attempts to challenge key selling points of the iPhone, which in the US is carried only by AT&T. The guide notes, for instance, that AT&T's HSPA (3G) network covers "only 40-50%" of Americans, approximately half the amount handled by