My Phone, the cloud-based Windows Mobile back-up service we peeked at in beta in May, has officially launched. The free 200MB of online space for phone data remains the same, but premium users get new location and security features.
As it was in beta, My Phone isn't an up-to-the-minute sync of all your phone data. Once a day, or when manually activated, it sends your My Documents contents, calendars, contacts, SMS database and other phone data you wouldn't want to lose entirely to your online backup space. My Phone also lets you access that stuff through its web site — helpful especially for digging through old text messages, or calling up a quick contact when your business phone is off.
Premium users (TechCrunch reports a $US4.99 price, but doesn't note whether that's monthly) can also activate a few MobileMe-like features for lost or stolen phones. From the My Phone site, Premium users can ring their phone to help find it, lock or erase it if misplaced, and locate the phone on a map with GPS, in case your local police department feels like helping you find it. You can try out these features free for 60 days, in case you need to quantify how often you lose your phone.