Hi,
it certainly depends the phone. I am think last time I checked, they had a strict policy with vibrations, and you could get rejected from the app store if you'd abuse it.
On top of that, I think Unity wrapps the calls and do not offer much control unfortunatly. within XCode you can create vibrating patterns, but that's already native coding and all.
If you can find a unity script or something that does control vibration, let me know, I'll have a look if that's doable as a PlayMaker Action.
Bye,
Jean
