I forced it on my unbranded Quantum.Member dv220s announced that he got Tango for his AT&T LG Quantum. In the comments to a news article he said, "LG Quantum got it. Without even forcing it. Now enjoying 7.10.8773.98." No luck for me yet, though.
Maybe you were an accident or part of a small pilot program.That's weird that nobody's got it yet.