iPhone 4, SAR, and antenna contact

The iPhone 4 uses the metal edge of the phone as its antenna. This means that it’s pretty easy to make contact between the antenna and your hands. As you’ll know if you’ve ever grabbed the antenna of a TV or FM radio, the human body conducts, and can have a pretty big effect on reception. Users are now reporting that it’s true for the iPhone too. You can lose most of your signal strength by holding the phone the wrong way.