Apple Inc. said Friday its formula to calculate signal strength is “totally wrong,” and that it will start using a new formula by AT&T to calculate how many bars to display to represent signal strength.

The announcement comes as customers continue to complain of a significant loss in signal when holding the iPhone G4 in a certain way that seems to interfere with the phone’s antenna. Unlike previous iPhones, the new phone’s antenna is a steel frame that wraps around the device. Get the full story »