Do you use the swipe to type feature on your phone?
Is this how most people type on mobile these days, drawing lines all over a keyboard instead of tapping the individual keys? I've never had an iPhone so I don't even know if they can do this natively, but I know you can switch keyboards at least, so it should still be an option if not.
Ah, yes. For one handed typing. It's probably pretty accurate if it's just learning off of the few phrases you type one handed. I'm sure it's the same few pretty frequently.