Verizon iPhone won't be AT&T's doomsday

Apple's iPhone is widely expected to come to Verizon Wireless next year. Here's the surprise twist: That won't spell disaster for AT&T. The telecom giant -- and many of the industry analysts who cover it -- predict that the vast majority of AT&T's roughly 20 million iPhone customers will stick with the wireless carrier. AT&T had the strategic foresight to lock most of them into long-term contracts lasting deep into 2011 and beyond. That makes it painful for those subscribers to switch to another carrier -- and makes the Verizon iPhone pill much easier for AT&T to swallow. Here's a closer look at why AT&T doesn't have to worry too much about its upcoming iPhone rival.