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iViewer for Mobile Devices is free to use on any device, with the following limitations placed on unlicensed devices:
All of these limitations are lifted on unlicensed devices if you do not have any external communication sockets defined (no control system defined in your GUI Project properties, and no external systems defined in System Manager).
The one exception to the above rule are Loopback systems defined in System Manager (ie. Systems defined to communicate to IP address 127.0.0.1, in order to communicate directly back to iViewer in order to create demo user interfaces, etc).
In summary, if you only have loopback system(s) defined (or no connections defined in your GUI at all), then no license is required for page flip, subpages and HTTP requests to be fully functional.
By licensing a device to run iViewer, you enable page flips and subpages whilst having external communication sockets fully available.