I recently purchased a new one-piece snap-on case for my unlocked 3G iPhone (version 2.2.1). Made in Korea (don't want to give the actual brand name, but this is a clue), described as Platinum in color (actually it is more like chrome), and it is very thin. I have never read any negative reviews of this specific product and was surprised when I found that I was having a serious problem with it. When the case is on, I invariably get "no service" or almost no bars. Also, for one second all five bars, the next, none. In one room I will have all five bars. Step into the next room I will show none. Now when I take the case off, 4-5 bars reappear. I have tested this over and over again with the same exact result. So, my new case has been retired and my problem has gone away. That's my story.