Passed exactly a day after the release of
Apple iOS 4.1 beta 1As already released iPhone iOS 4.0.1

As promised by Apple, the new firmware has
improved the formula for determining the number of bands to indicate signal strength.')

All owners of officially white apple phones who have iOS 4.0 are advised to upgrade
I have an iPhone 3G, when I upgraded to iOS 4.0, I regretted it, the phone began to hang, it was awful ...
I just updated to iOS 4.0.1, the brakes were gone, the phone began to work much faster.