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One of the most-hyped, if under-used, features on Helio phones is the Buddy Beacon. Using the phones’ integrated GPS, you can use it to update your friends as to where you are, and request they do the same. The downside is they all had to be Helio members.

But Helio sold Buddy Beacon to uLocate, who’s expanding the application to Sprint, Boost, Alltel, Metro PCS and the iPhone, while keeping it in the Helio family.

What’s really cool is they’ve created a Facebook app that you update from your phone, so your peeps know where you are whenever you’d like them to. As you can see in the image above, Peter Ha’s at a Russian brothel in San Diego. It works. Free for Helio users, carriers will set their own prices when they launch their independent versions.

Buddy Beacon [Facebook App]