Despite a considerable amount of positive user feedback regarding Apple iOS 5 and the software smartphone accessories it contains, consistent problems have been reported concerning the drain of battery power the OS causes in the iPhone 4 and 4S. Although it did not address the issue immediately, Apple acknowledged it soon enough and announced the release of an upgrade for the system that would correct the battery problem and other extant glitches.

According to InformationWeek, this upgrade has reached a small test audience of iPhone users. Early reports indicate that many of these individuals have stated that the problem has ceased completely or been reduced by a significant margin. In several notable examples, readers of the tech magazine Wired who took part in the test said that battery loss was reduced to 3 percent per hour, as opposed to 15 percent per hour before the upgrade.

The news source reports that the upgrade will be officially available from Apple within the next few weeks, but that the company has not provided any details regarding the specific cause of the iOS 5 issues.

Additionally, the upgrade to 5.0.1 did not work for all users involved in the test. Some reported no change to battery performance, and one stated that it caused battery life to fade more quickly.

PCWorld reported that unlike the antenna of its predecessor, the iPhone 4S antenna has experienced no performance issues.