Is it possible to get above 30 FPS on an iOS device?

Yes- when you compile to xcode, look in the AppController.mm- there's a variable kFPS.

Set this to, say 60.

It's good practice I think to set it as high, so you have room to lower the cap.

Thereafter, be aware that 60fps games eat batteries for breakfast :)

The latest version of Unity allows this to be configured more easily using [Application.targetFrameRate][1] from a script.

[1]: http://unity3d.com/support/documentation/ScriptReference/Application-targetFrameRate.html

Yes, i can confirm this. Application.targetFrameRate = 60; worked for me on iOS (iPad 3) to raise the default limit of 30 FPS to 60 FPS ....

This isn't a direct answer, but I hope it helps to put frame rate in perspective:

Film has been 24 frames per second for a long time. US TV broadcasts 29.98, PAL, used outside the US is usually 25. Digital (generally 720p or 1080p) can be either 24 or 25 FPS, though I find 24 is becoming the standard since it matches film.

The human eye is fooled by as little as 12 frames per-second, which is what the old cartoons would use for just this reason. They could draw less frames and still achieve smooth motion.

When dealing in 3D (stereoscopic), generally the frame rate is doubled to get alternating frames for each eye (depends on the viewing system).

As long as you are over 24 FPS you shouldn't have anything to worry about. Anything over 30 is arguably a waste of processing power. A lot of people find super high frame rates creepy in live action. It can be nice for games but again, this is of diminishing value to quality when compared to processing (and I hear battery) power.