Apple says it will be done giving away free bumper cases to iPhone 4 owners on September 30. The company posted a message on its website today notifying the world that the freebies are over.

"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, and we want to continue providing them a Bumper case for free. For everyone else, we are discontinuing the free case program on all iPhone 4s sold after September 30, 2010. We are also returning to our normal returns policy for all iPhone 4s sold after September 30. Users experiencing antenna issues should call AppleCare to request a free Bumper case."

There have been many rumors that Apple has made some adjustments to the antenna design of the iPhone 4 and that new iPhones will no longer need a case, although Apple has been mum on the issue.