Reporting its third-quarter financial results, Apple’s U.S. iPhone carrier partner AT&T revealed that it saw 2.4 million iPhone activations from the device’s launch on July 11 to the end of September. Of those 2.4 million activations, approximately 40 percent were new AT&T wireless customers. “I am particularly pleased with the customer response to the iPhone 3G,” said AT&T CEO Randall Stephenson. “The new…