Nexus S 4G for Sprint at CTIA here today and it's pretty much what you'd expect: a Nexus S with its GSM / HSPA radio swapped for a set of Sprint-compatible CDMA / EV-DO and WiMAX radios. While the Nexus S 4G lacks a SIM slot, it's actually 0.3mm thicker than the Nexus S -- that's the thickness of a business card, and is meaningless for all practical purposes. The phone also features a 4G signal indicator in the status bar, along with a 4G sub-menu in the wireless settings. Our demo unit was running Android 2.3.4 (!) -- a version we have not yet come across -- but we were told that neither the hardware nor the software are final at this point. So don't be surprised if the production model receives a few tweaks before launch. Perhaps a Sprint logo? Enjoy the gallery below, and hop past the break for our hands-on video.