Apple Inc admitted its iPhones overstate network signal strength and promised to fix the issue in the coming weeks, following complaints about the effectiveness of the phone's wraparound antenna. Apple said that its signal strength miscalculation dates back its original 2007 iPhone, but it did not directly address concerns that iPhone 4's antenna design played a role in recent problems. It was the third time in three weeks that Apple apologized to customers of iPhone 4, its latest smartphone, “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,” Apple said in an open letter to customers published on Friday.

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