Apple has released a public letter addressing the antenna issues with the iPhone 4, which have dominated the tech press since the device's release. The company says it has been very surprised to hear so many reports of reception problems and that it has been investigating them. Here's an excerpt from the letter: To start with, gripping almost any mobile phone in certain ways will reduce its reception by 1 or more bars. This is true of iPhone 4, iPhone 3GS,