Running background processes in iPhone

Question

Can we run following tasks in the back ground in a iPhone application:

√ Camera --> Take photo (timer = infinity) (keep on taking photos) 
√ Video
√ Backlight --> On for certain duration (Customizable)
√ Flickering --> 5secs (Customizable)
√ Vibration (Background)
√ Voice Call --> Long call or multiple calls (Call duration/Time b/w calls/

Answer 1

• Camera - no
• Video - no
• Backlight - no
• Flickering - don't know what this means
• Vibration - could be triggered with Push
• Voice Call - yes, VOIP is allowed

Answer 2

No iOS multitasking is very restrictive in what you can do.

You could do a voip service in the background, but you won't have access to backlight, camera, vibration motor etc.

More info here