The W580i has a 1,000-contact phone book with room in each entry for five phone numbers, an e-mail and Web address, a job title, company name and work address, a birthday, and notes. You can save contacts to groups and pair them with a photo and one of 19 polyphonic ringtones for caller ID. You also can select a video for callers and you can choose a pattern for the side-mounted lights. Other essentials include a vibrate mode, a voice memo recorder, text and multimedia messaging, an alarm clock, a calendar, a task list, a notepad, a timer, a speakerphone (usable after you make a call), a stopwatch, and a calculator. Of course a phone like the W580i wouldn't be complete without such offerings as full Bluetooth (including a stereo profile), e-mail support, PC syncing, USB mass storage, a code memo for storing sensitive information, and USB cable support. The handset also capitalizes on its "Walkman" name by offering a number of fitness applications. There's a pedometer for running and walking, a sports trivia game, and a fitness trainer for tracking your workouts. There's even a bizarre yet interesting application that will let you calculate how long it would take you to walk to various world locations from your home city. With a couple of exceptions, Sony Ericsson still hasn't fully embraced the slider phone trend. In fact, after the Sony Ericsson W850i, the W580i is only the second slider model from the company that we've reviewed. And fortunately, Sony Ericsson was more successful this time around. While the W850i was bulky and had unintuitive controls, the W580i improves on both fronts. We wouldn't be exaggerating if we were to say the W580i is one of the most eye-catching handsets we've seen all year. It has a sleek shape and compact dimensions (3.9 inches by 1.8 inches by 0.5 inch; 3.3 ounces) that make it easy to take on the go. The slider mechanism is well-constructed; we could open it with just one hand but it wasn't too loose. In the phone's Settings menu you can choose to end calls automatically when you close the phone.