CNET senior editor Natali Del Conte tests Microsoft's My Phone service to locate her lost phone. Basically she leaves her AT&T Pure (HTC Diamond 2) in a taxi deliberately, and then once back in her office logs into the My Phone service and uses its phone retrieval features to try to get the phone back.
Unfortunately, the GPS couldn't provide an exact location of the phone.
What did work was making the phone display a message asking whomever found the device to return it (with contact instructions).
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Do you use the Microsoft MyPhone service? Have you used it to locate a lost phone?