At 60% ownership, is the U.S. smartphone market saturated?

Forty percent of U.S. mobile customers still use feature phones and represent an untapped market. Except for BlackBerry, churn between smart platforms is still negligible; it's the non-smartphone makers who are shedding customers. And even at 60% penetration, the rate of smartphone adoption is not slowing in any perceptible way. Worldwide, 4 billion people are about to switch from feature phones to smartphones.