Sony’s latest effort to capture the hearts, minds, and money of teens and twentysomethings is a Web browser, messaging program, wireless phone, and digital music player all rolled into a handheld gadget that goes by the name Mylo. The features can be found on just about any midrange cell phone these days, but there’s one key difference: The Mylo works on any Wi-Fi wireless Internet connection, so you can surf the Web or chat on campus, at the coffee shop, in the bookstore or wherever there’s an 802.11b hotspot. Mylo–short for “my life online”–is a bit pricey at $350, but it could be a money-saver if you count how much cellular carriers charge for data services.