Despite AT&T's low customer satisfaction rating and the highest dropped-call rate in the industry, only 8 percent of AT&T customers said they were likely to switch providers in the next 90 days – compared to 7 percent of Verizon's, 10 percent of Sprint's and 14 percent of T-Mobile's. "AT&T's low churn rate – despite its relatively poor Very Satisfied rating and its high percentage of dropped calls – is attributable to the huge advantage it continues to maintain as the exclusive U.S. service provider for the Apple iPhone," reports ChangeWave. Apple is rumored to be at work on a version of the iPhone that would be compatible with Verizon's CDMA-based network, though Apple has never confirmed nor denied such rumors. It's expected that Verizon will receive its own iPhone once AT&T's exclusivity contract with Apple expires, likely in early 2011. "It's [Apple's] call," Verizon CEO Ivan Seidenberg said at an April 6 press conference. "Eventually it's our view we'll get to carrying Apple."