New Windows Phones hit AT&T stores; Our Free-Time Machine mystery revealed

To celebrate the debut of the Nokia Lumia 900 and HTC Titan II—the first 4G LTE Windows Phones at AT&T—we’re giving away something most of us crave but can never seem to get enough of: time.  The Nokia Lumia 900 in white goes on sale April 22. Models in black and cyan are available in AT&T Stores nationwide today.

To pull off this seemingly Einsteinian feat, we’ve installed Free-Time Machines in New York, San Francisco, and Chicago (see where to find one). They’ll operate from 8 AM to 6 PM local time today.

What’s a Free-Time Machine, you ask? Think of it like an ATM. Only instead of cash, these things spit out prizes that will save you time—stuff like free grocery deliveries, cleaning and dog-walking services, and access to personal concierges.

Or the ultimate time-saving tool—a new Windows Phone.

A few lucky folks will have celebrity help at their disposal. In New York, Kourtney Kardashian will free up one winner’s time by providing access to her hair stylist, makeup artist, car service, and a personal shopper from her clothing boutique, DASH.

In San Francisco, 49ers tight end Vernon Davis will give one time-pressed winner some extra help for the day. While in Chicago, Top Chef winner and James Beard Award-nominee Stephanie Izard will dish out free time and food to a lucky someone.

Don’t live in one of these cities? Just visit our online Free-Time Machine at www.freetimemachine.com for a chance to win a trip to Hawaii and other great prizes (must be a U.S. resident 18 or older). And check back here throughout the day for more on our new phones—and to see what contest winners did with their newfound free time.