A Forms application currently cannot run on a mobile device. However you can use a third party product like OraPlayer to run your Forms application business logic, accessed though something like ADF Mobile, on a mobile device. This would allow you to not only have a standard Forms application on the desktop, but also access the same business logic from other devices such as smart phones, tablets, etc.
Check out OraPlayer (an Oracle Partner):
Information about ADF Mobile is available here: Oracle ADF Mobile