With the launch of Apple's iPhone, a lot of consumers have dropped off their other devices to get the latest in the technology market. A recent study conducted showed that a lot of users from Alltel and T-Mobile are moving on to AT&T and the iPhone. iPhone early adopters were "ten times more likely than other new phone buyers to have previously owned a Treo and three times more likely to have owned a T-Mobile branded phone, such as the popular Sidekick model."

When it came to carriers, Alltel and T-Mobile were said to have lost the most customers to AT&T, as consumers who "switched carriers to buy an iPhone were three times more likely to switch from Alltel or T-Mobile than from other carriers." Notably, the lack of "corporate email support" was pinpointed as the main reason that many BlackBerry users didn't make the leap, but it did praise the iPhone for helping to "bridge the gap between consumer-focused feature phones and productivity-focused smartphones."

Source