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T-Mobile will offer 30 devices for free as part of this promotion, including high-end smartphones such as the HTC HD7, T-Mobile G2 and Samsung Vibrant. For a full list of devices in T-Mobile's inventory go here.
The promotion offers some really solid savings; for example, the HTC HD7 normally costs $499 and the Garmin-Asus Garminfone's standard price is $449.
Know that to take full advantage of this promotion, you need to visit a T-Mobile store. You can also choose to buy a phone online through Valentine's Day, in which case only select smartphones will be free (for example, the HTC HD7 is $99).