Yep. The forms use html and javascript to be cross-browser compliant, meaning that the features you see on your computer will be the same thing you get in a mobile browser.
I've been getting reports recently that my form doesn't work on IPads. In particular the submit button doesn't work. Unfortionatly I don't have an IPad, but here is a link. http://app.formassembly.com/forms/test/186177
If someone from support could take a look that would be great.
I just tested your form in the iPad simulator on Mac and didn't have any trouble submitting it. I'll test on an actual device as soon as possible. That said, the simulator has the same browser display properties of the device itself and I generally trust its opinion.
It's possible your form's users are having trouble with the message that pops up on the required validation after they hit submit. It looks just like the iPad's system messages due to the iPad web browser's standard formatting. Unfortunately, there's not a lot we can do to change that. If that is indeed the problem, the best I can suggest is adding a custom message that's more likely to be read than our standard message, or changing the color of the outline of your required fields that will pop out more.
Without knowing more about your form's users' processes or set-ups when accessing the form, that's my best guess. We haven't heard anything through our other support lines that would indicate a larger problem. Please let us know if you receive more and/or contradictory reports.