Since there are many applications that can make use of a mobile platform SmartForms can be configured to be viewable and usable on many different smartphones. Some things to consider when enabling mobile usage is screen settings, device type and other functionalities you may want for your application. The following documentation should help in the creation of forms that are usable on the mobile platform:

http://help.k2.com/HelpPages/K2smartforms1.0.6/default.htm#Using_Mobile_Devices.html#screensettings