It was all about the five-way navigator. A comfy D-pad underneath the Treo 650’s 2.5-inch screen, combined with a comfy keyboard, made this follow-up to the Treo 600 my favorite smartphone for nearly two years. Other welcome features on this Sprint communicator included a top-mounted ringer switch, a relatively high-res display (320 x 320 pixels), Bluetooth and Microsoft Exchange support. I also loved how fast the Blazer browser was for Web surfing, aided by a 312-MHz Intel CPU. The VGA camera wasn’t the sharpest at the time, but it took fairly clear photos.