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Several users have reported poor battery life after the update to iOS 4.0.1, on both iPhone and iPod touch models. Fixes Disable/check location services. Overactive location services usage can result in poor battery life. Specifically, apps that use location services in the background can quickly drain the battery. To check location services usage on an [...]

Although the iOS 4.0.1 update was ostensibly designed only to “improve the formula to determine how many bars of signal strength to display” and address other minor bugs, a number of users have reported significantly degraded actual signal strength (not just fewer bars, which may occur with the same signal under iOS 4.0.1) and increased [...]

Several iPhone 3G users have experienced a significant slowdown, including slow app launching, delayed reactions to taps, and generally poor interface responsiveness, after the iOS 4.0.x update. We previously noted a few fixes for this issue (performing a hard reset, restoring but not from backup and closing extraneous Safari windows) with which users have experienced some [...]

Some users have reported repeated crashes in Safari for iPad, especially after the iOS 3.2.1 update. Users have reported similar issues, albeit not as frequently, with Safari for the iPhone and iPod Touch. There are a number of potential causes for this issue, but it appears to occur most frequently when very large pages (especially [...]

Although most readers have reported that iOS 4.0.1 simply modifies the display of signal bars (as intended), some have reported an increase in the incidence of dropped calls, particularly on iPhone 3G and iPhone 3GS models. While the new update includes a modem software update (which theoretically could result in a change in actual signal [...]

A number of users have reported reduced battery on iPhones and iPod touches after updating to iOS 4.0.1. These reports crop up after virtually every iOS update, and the problem can generally be resolved by running through the first 3 procedures in the 4 Rs: 1. Reboot (hard reset). Hold down the sleep/wake and home buttons simultaneously [...]

Apple has released iTunes 9.2.1, which addresses a number of issues we’ve previously reported, including slow syncing, iOS 4.0 device issues when restoring from problematic backups and problems caused by third-party plug-ins. The full list of bug fixes: “Disables older versions of some incompatible third-party plug-ins Addresses minor issues with dragging and dropping items Addresses a [...]

UPDATE: It appears that users who have reported resolution to this issue with the iOS 4.0.1 update may be experiencing improvement simply due to the restore and reset processes that occur during any iOS update, as Apple has now said that a permanent fix for the proximity sensor issue is coming in iOS 4.1 — [...]

It appears that one of the unnamed “bug fixes” included in iOS 4.0.1 is the elimination of some Microsoft Exchange issues, particularly an issue in which Mail stalls on “Checking for Mail,” or cannot receive or send mail. Apple’s Knowledge Base article on the subject now states: “Immediately after updating to iOS 4.0, some users [...]

UPDATE: iOS 4.0.1 Resolves iPhone 4 Proximity Sensor Issue for Many Users Error 9 and Other Problems Updating iPhones to iOS 4.0.1 iOS 4.0.1 Fixes Microsoft Exchange Issues —– Apple has released iOS 4.0.1 for the iPhone 3G, iPhone 3GS and iPhone 4, and iOS 3.2.1 for the iPad. Release notes for iOS 4.0.1 state [...]