AT&T's BlackBerry 8300 Curve wasn't exactly long in the tooth, having been on the market for mere months. Still, once T-Mobile launched the 8320 Curve, a superior version that makes calls over Wi-Fi, it was clear that AT&T had to do something to stay competitive. Enter the 8310 Curve. While this smartphone doesn't include Wi-Fi, it does feature GPS support with built-in TeleNav maps. There's also the optional ($9.99 per month) TeleNav GPS Navigator, with its excellent voice directions and location-based services. This Curve comes in two new colors, a grayish titanium hue and a brilliant red.