According to a survey by UBS, handset makers RIM and Nokia are hemorrhaging customers to Apple.
Here's the chart showing where people are moving to and where they are moving from:
According to UBS, the vast majority of those dumping Nokia and RIM and going to Apple (and, to a far lesser extent, Samsung and HTC), which has the best customer retention rate of any of the companies. Customers are so happy with their iPhone that 89% are planning to stick with with Apple.
Good news for Apple, not good news for other makers.