The title pretty much asks the question I am wondering. NewYearsEve...sad night. Dropped my iPhone 4, shattered the back glass. Tears were present. I went to Sw-box.com and purchased 3 replacement backs, at a wonderful price. I purchased this back case - http://www.sw-box.com/Iphone-4-Metal-Back-Cover-Silver.html and also in Blue. The cases themselves are great! They look great, they feel solid and they really do fit amazingly on the back of the iPhone 4. What I've noticed is this - when I replaced the back with the Metal backing, my service bars dropped and don't really change much. When I take the back off, the service comes back?! But the strange thing is... When I use another back, the CarbonFiber back case, everything works well! I've done several 'tests' to determine if I'm going crazy or not. I have the SpeedTest.Net app on my iPhone, and it's always worked accordingly. When I place either the Silver or Blue Metal back, it doesn't detect a network connection. When I use the Carbon Fiber, it detects and begins the test without issue. I thought... that.... the Cellular antenna was built into the band of the phone?! And doesn't need to penetrate the back of the phone?! Am I missing something.... Could someone...anyone.. shed some light on this matter for me... because.. Im losing my cookies.