Inside, the CDMA iPhone has a substantially changed antenna and RF design to accommodate that diversity. There are two cellular antennas in the CDMA version, as opposed to one in the UMTS version. With the phone facing up, the first cellular antenna consists of the new strip at the very top. The second is the strip running from the bottom left, across the bottom, and up the right side of the phone. The far left side with volume buttons and the vibrate switch is part of the WiFi and Bluetooth antenna.
I cannot, for the life of me, get the “death grip” to happen on my Verizon-powered iPhone. Be sure to check out the whole review — it is great.