iPhone OS 4 發佈會

多項新功能發表

Background audio
VoIP
Task completion
Fast app switching (multi-tasking)
Folder
Battery
Background location

http://www.engadget.com/2010/04/08/live-from-apples-iphone-os-4-event/?sort=oldest&refresh=0

但我最關心的是, 現時的3G, 3GS或iTouch可否upgrade到OS 4!?