You're intelligent enough to know that carrying around a cell phone and a PDA is inefficient. Lighten your load by picking up an all-in-one device. Whether you use it as an organizer, an e-mail device, a cell phone, or all of the above, getting a smartphone is a smart move. See our top five picks for these phone-PDA hybrids; we've picked one for each major carrier, as well as one The bottom line: The Samsung Rugby Smart can take plenty of punches, without skimping on the smartphone features. Unlike other rugged phones, it's easy on the eyes and it can run on 4G The bottom line: The RIM BlackBerry Curve (aka BlackBerry 8320) for T-Mobile is the best BlackBerry we've seen to date as it offers Wi-Fi, best-of-breed design, and excellent performance The bottom line: With the design improvements and addition of features such as 3G and GPS, the T-Mobile Sidekick LX 2009 graduates from a simple messaging handheld to a real connected, all-in-one communication device for the younger crowd