One giant question regarding the almighty Nexus One/Google phone is which carrier -- if any -- will be selling the darn thing. The prospect of the phone being sold sans carrier is alluring, if it's available in both CDMA and GSM flavors, and with 3G support for all.
That's fairly simple on the CDMA side. But on GSM -- and we're talking AT&T and T-Mobile here -- there are radio frequency problems at work. AT&T uses the 850MHz and 1900MHz frequencies for 3G (and it's been switching everything to 850MHz of late), while T-Mobile is the only U.S. carrier to use 1700MHz. And that basically defeats one of the main reasons we love being able to swap SIM cards.

Nexus OneNow, back to how the Nexus One may be sold. Say carriers aren't involved. For as often as we wish they'd keep their cotton-pickin' hands off hardware, you can't deny their advertising power. To wit: The recent war between Verizon and AT&T, and Verizon's Droid ads. HTC, as a manufacturer, has recently begun advertising. But other than that, all the PR money comes from the carriers. T-Mobile has Whoopi and Jessie and Phil (and don't forget Catherine). And Sprint has done more than its fair share of advertising in the past couple years.

So, if Google goes it alone, with no carrier support, it would have to break into the advertising game. And despite its worldwide domination in the online advertising world, it's never done its own advertising before. (It was a big deal when Google even mentioned the Droid on the otherwise Spartan home page.)

Now there's word that T-Mobile's in play. And there's also whispering that Verizon passed on the Nexus One. [both via All Things D] Remember that there's long been talk that Verizon passed up the iPhone. If the Nexus One turns out to be a hit, that could be a gaffe that's at least in the same ballpark.

But we're getting ahead of ourselves here. All we know right now is that a lot of Google employees have a new phone. We don't know whether it's in mass production, what it ultimately will be called (Nexus One's like a code name, and Google phone and Opus One us totally unofficial), and when it might see the light of day.

But you can bet that as soon as we know, you will, too.