Carrier IQ is on iOS, Kind Of

Turns out Carrier IQ is also on iOS devices as far back as iOS 3. However, it’s only running when you explicitly allow it. It’s what powers the Diagnostics & Usage setting, which is toggled during setup and can be turned off at any time. Furthermore, it only logs technical call information and location only if Location Services are enabled. It does not log key presses, URL history, SMS content or any of that other scary stuff happening on other devices.

Grant Paul also points out that it appears to be carrier-specific, with entries for AT&T, Verizon, Sprint and KDDI.