Noting U.S. smartphone sales growth has slowed dramatically, and that many first-time buyers are...

Noting U.S. smartphone sales growth has slowed dramatically, and that many first-time buyers are now prepaid users who often go for low-end Android (NASDAQ:GOOG) devices, NPD's Stephen Baker questions whether the next iPhone will lead to major U.S. share gains. Working in Apple's (NASDAQ:AAPL) favor: the iPhone's customer loyalty is unmatched, and it has been gaining share in the U.S. even as its European share has declined.