We’ve been expecting a big advertising push to introduce the first Google-branded cellphone and we haven’t seen much yet except for some informational videos shot by Google (NSDQ: GOOG) employees. That’s all about to change, T-Mobile’s marketing head Denny Marie Post tells WSJ in an interview, T-Mobile’s adopted a premise that “curiosity is everywhere,” and based on that will be rolling out a TV spot this week that will build over the next few weeks, she said. Calling it a “nontraditional marketer,” Post said Google is like her previous employer Starbucks, which doesn’t have to spend much money on marketing. While Google wants to make sure its brand is represented appropriately, all of the decisions rests entirely with T-Mobile, which will be picking up the tab for the TV commercials . When asked if the G1 could ever generate as much buzz as the iPhone, she said the carrier has played out many scenarios to its benefit. “More than the device, it’s opening the door to the open platform. And I think that’s where the news is going to come from.” But don’t get it twisted; T-Mobile isn’t trying to mimic AT&T (NYSE: T) or Apple: “I think we’ve taken our own path here.”

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Here’s T-Mobile’s first TV commercial that will air for the G1: