Apple made good on its promise of a software update for the iPhone 4.

On Thursday the company released iOS 4.0.1, an update to the iPhone's operating system that was introduced just over three weeks ago.

The update contains bug fixes and improvements for "the formula to determine how many bars of signal strength to display." iOS 4.0.1 is compatible only with the iPhone 3G, iPhone 3GS, and iPhone 4.

This is the update that two weeks ago Apple said was coming. In an open letter at that time, Apple said that the problem some people are having with reception and bandwidth dropping off when gripping the iPhone 4 in a certain way is linked to software that incorrectly displays the phone's signal bars. The update was promised to make the signal bars display more accurately and more clearly.

More: http://news.cnet.com/8301-31021_3-20010698-260.html

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