Users of the newly launched iPhone 4 have been told by Apple that the poor reception they have been experiencing has been the result of using an incorrect algorithm rather than being caused by the antenna design. "Upon investigation, we were stunned to find that the formula we use to calculate how many bars of signal strength to display is totally wrong. Our formula, in many instances, mistakenly displays two more bars than it should for a given signal strength," Apple said in a statement. The company will issue a free software update within a few weeks that incorporates the corrected formula, and since this mistake has been present since the original iPhone, this software update will also be available for the iPhone 3GS and iPhone 3G, the company said.