I would say, let there be a fresh set of patent wars. Because Apple is granted a patent on app switching and starting an app while on a call. After reading the patent description, first thing that I came to mind is, how come Nokia missed out on this patent. I remember doing something similar on Symbian devices and my N900 too supports this.
Patent 8,082,523 Description:
Inventors: Forstall; Scott (Mountain View, CA), Christie; Greg (San Jose, CA), Lemay; Stephen O. (San Francisco, CA), Van Os; Marcel (San Francisco, CA), Chaudhri; Imran (San Francisco, CA) Assignee: Apple Inc. (Cupertino, CA)
Appl. No.: 11/969,908 Filed: January 6, 2008
A portable electronic device displays, on a touch screen display, a user interface for a phone application during a phone call. In response to detecting activation of a menu icon or menu button, the UI for the phone application is replaced with a menu of application icons, while maintaining the phone call. In response to detecting a finger gesture on a non-telephone service application icon, displaying a user interface for the non-telephone service application while continuing to maintain the phone call, the UI for the non-telephone service application including a switch application icon that is not displayed in the UI when there is no ongoing phone call. In response to detecting a finger gesture on the switch application icon, replacing display of the UI for the non-telephone service application with a respective UI for the phone application while continuing to maintain the phone call.