iPhone 4 owners are starting to sell their used units as Apple prepares to announce its successo.TELSTRA this morning has released plan details for the iPhone 4S, which goes on sale in Australia on Friday.Perhaps to no one's surprise, the just-announced iPhone 4S has been been leaping off the shelves in advance of it ever hitting shelves at all.Apple is rumored to begin selling unlocked versions of the iPhone 4 in the U.S. starting at $649 on Wednesday.The market response may have been muted by the fact that the reception for the iPhone 4S, unveiled on Tuesday in California, was lukewarm.
