Apple [AAPL] has announced that their free case program for the iPhone 4 will end on the 30th of September 2010. Apple launched the free case program a while back after iPhone 4 users had problems with the new antenna on the iPhone 4.
Apple is also going back to their normal returns policy, for all iPhone 4s sold after the 30th of September 2010, although it looks like if you have a problem with your iPhone 4 you may still be able to get a free case.
We now know that the iPhone 4 antenna attenuation issue is even smaller than we originally thought. A small percentage of iPhone 4 users need a case. Users experiencing antenna issues should call AppleCare to request a free Bumper case.
It looks like Apple will still give free cases away if you are having a problem, but rather then give them away to everyone, it will just be to people who call AppleCare and ask for one.
Have a look at our article on the difference between the iPhone 4 and iPhone 4S.
Apple via Dvice