Do you understand that this is related not just to how you hold the phone, but where you are and what reception you are getting. There are plenty of people (most?) that can not produce this on the iphones either.
I wasn't attempting to insinuate that all iPhone 4G's are easy to trigger this in, but I wanted to defend Blackberry from the unfair attack by Apple. I have had a few Blackberries and none have ever had any noticeable hand position related signal loss across a variety of signal strength and location environments.
How is this an unfair attack? It is not an attack at all, it is simple physics. All phones have this problem, the media are focusing on just one phone, because it is more newsworthy. Apple are saying it is a problem with most phones out there, the iPhone is no different. You really see that as an attack.