Steve Jobs mentioned in yesterday's iPhone 4 press-conference that other smartphones have similar antenna issues like experienced on the iPhone 4.
Steve Jobs mentioned phones from Nokia and RIM that are supposedly suffer from the same antenna issues. Both companies issued statements defending their antenna designs and do not want to be pulled into this mess by Apple.
Quote from RIM's statement: "During that time, RIM has avoided designs like the one Apple used in the iPhone 4 and instead has used innovative designs which reduce the risk for dropped calls, especially in areas of lower coverage. One thing is for certain, RIM's customers don't need to use a case for their BlackBerry smartphone to maintain proper connectivity." Read the full statement on Crackberry.
Quote from the Nokia statement: "In general, antenna performance of a mobile device/phone may be affected with a tight grip, depending on how the device is held. That's why Nokia designs our phones to ensure acceptable performance in all real life cases, for example when the phone is held in either hand. Nokia has invested thousands of man hours in studying how people hold their phones and allows for this in designs, for example by having antennas both at the top and bottom of the phone and by careful selection of materials and their use in the mechanical design." Read the full statement on Engadget.
I go with what RIM said. If I need to use a case to maintain proper connectivity something is wrong. By the way, Consumer Reports is still not recommending the iPhone 4.