Rumours suggest Apple's next mobile OS will be available to all non-iPhone devices sooner than later, including email based FaceTime video calling.

MacRumors.com reports that iOS 4.1 Beta 3 adds a new option in the iOS 'Contacts' application, which offers users a chance to make FaceTime calls using either a phone number or an email address. "This would allow FaceTime compatibility with devices not associated with a phone number such as future camera-enabled iPads and iPod touches," MacRumors notes.

The recently introduced iPhone 4 has two built-in cameras, one on the front above the display and one on the back next to the LED flash. The front camera has been tuned for FaceTime, and offers the right field of view and focal length to focus on your face at arm’s length, showing users in the best light insists Apple. Currently iPhone 4 users need only click on 'Contacts' and tap the FaceTime button to start a call.

Apple are expected to refresh the iPod range next month, including a new iPod touch, while a 7-inch mini-iPad could also be announced.

Apple iPhone 4