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In apple documentation I saw that minimal requirements for ARC is iOS 4.3, but on WWDC 2011 video they talk that minimal requirements in iOS 4.0.
On what minimal iOS version ARC will work?
Will ARC work on iOS 4.0?
ARC is function of the compiler rather than the device, so technically it has nothing to do with the OS it is being used on. The difference between the two is the actual zeroing of weak references. Read this for even more info about it.
Running an application that was compiled with ARC on a device with an OS prior to 5.0 will essentially manually zero out references rather than actually zero them out. The automatic zeroing is a core feature of ARC and is why you no longer need to call
deallocor release objects.