We're not going to explain every feature, quirk, and option in the Google Voice service, which is slowly giving out invites to those who request them. We've already taken a first look at Google Voice, and Google Voice's own Getting Started guide does a nice job explaining the service's ins and outs. We're looking to answer the question we seem to hear most often from commenters, friends, tech pundits, and just about everyone: What would I get out of it?

The wild card: number portability

If the rumors prove true, Google will, at some point this year, allow you to "port," or at least integrate, your existing cell phone number with its service, requiring none of the millions of phone numbers the search giant is supposedly securing. That would eliminate three of the service's biggest barriers to entry:

• Having to call Google Voice, and then dial a number, to place a call "with" your Google number, so it shows up on caller ID as such
• Having to store and reply to a separate SMS number for each of your contacts so that, again, your Google number shows up
• The time and hassle of getting your contacts to call you at your new Google Voice number, despite the fact that your old numbers still "work"

You might like Google Voice if you:

• Regularly use two or more phones: If you've heard about one feature of Google Voice, or its GrandCentral predecessor, this is it—and for good reason. Google excels at giving you one phone number for others to have, then letting you fine-tune which phones that number rings to an OCD level. If you want your wife to ring through to your work line between 9am and 5pm, but not your chatty, unemployed friend, you can do that. If you want your home landline to ring along with your cell during the hours your carrier charges for minutes, you can do that, too.
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• Loathe standard voicemail: "Please enter your passcode, followed by the pound sign!" "You have ... two ... new messages. To hear your"—You know what we're talking about. Using cell minutes and precious time just to hear your friend say "Try you again later" is almost as annoying as trying to wipe the voicemail icon off your phone screen. Google Voice makes it easy to play voicemail audio and read semi-correct transcriptions from a single web page, and it's a good bet it'll be integrated into Gmail for even easier access. When you're away from your browser, Google Voice sends voicemail notifications through email or text message, making it easy to know that you really don't need to step outside and call your sister back just to confirm you prefer Diet Dr. Pepper to Diet Coke.
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• Enjoy text messaging, but not phone keyboards (and fees): For anyone whose friends chide them about short or nonexistent text message replies, this is a game-changing feature. When sent to your Google Voice number, text messages are organized on the Google Voice site like chat conversations, with back-and-forth dialogue and options to reply or mark as read and archive. Writing a new message is also easy—hit "M" or click the SMS button, start typing a name or phone number, then choose the contact and type away. You'll still be charged for texts you receive on your phone, but it can be a real money saver when you're near your plan's limit for the month. Those with iPhones, Android handsets, or other smartphones can also make use of Google Voice messaging on the go with apps like the previously mentioned GV (Android) and GV Mobile (iPhone).
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• Want better filters on who reaches you, and when: Google Voice has four levels of annoyance resistance available to weary phone hostages. You can activate "Call Presentation" to have every unknown caller say their name to Google's servers, which then call you and ask if you want to take the call. If the annoyance is someone you know, you move them into a particular group (like "Annoyances") and make that group always go to voicemail. If they sometimes call about something important, Google Voice's ListenIn features lets you send them to voicemail, but hear what they're saying and pick up, if necessary. If you absolutely can't get a telemarketer or semi-stalker to take the hint, the video at left explains how you can simply have them hear something that sounds like an old-school disconnect notice.
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• Are down with Skype-like VOIP calling: Want to make calls over a computer-connected headset and not pay a dime for them? Google Voice allows you to add a phone number from the Gizmo Project and control when it rings through. Make a call through Google Voice's web interface, set it to ring your Gizmo number when it's connected, and the other party just sees your standard Google Voice number—you're effectively making an outbound call for free that Skype and the like would charge you for.
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• Make a lot of international calls: We haven't done a price comparison, but Google Voice's rates to international landlines and mobile numbers are said to be competitive, and you can call from your own phones without having to hunt down the right calling card.
  
• Record calls regularly (and legally): Just hit the number 4 during a call and Google's robotic queen announces "Call recording on." Right now, it only works with incoming calls, but the finished recording is ready for playing, downloading, or embedding in your Google Voice inbox in a matter of minutes. It's how I recorded my Jonathan Coulton phone interview for later transcribing and audio clip pulling.
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• Have or want an Android phone: iPhones, BlackBerries, Symbian-based models, and Windows Mobile devices will likely get Google-built apps for integrating Google Voice into their dialing, voicemail, and SMS interfaces. But Android phones already have an impressive third-party app for doing so, Evan Charlton's GV, and would be a pretty good bet on being the first, or at least among the first, platforms to get the Google Voice team's attention. Fully integrated Google Voice means free, conversation-threaded SMS, fewer hassles with your one-and-a-half phone numbers, voicemails that don't require talk time, and much more.

You won't like Google Voice if you:

• Rarely use your cellphone and/or text messages: Unless you're that rare breed of VOIP headset lover who doesn't ever talk on a cellphone, there's not a lot to recommend Google Voice to landline-focused folks. Your office's phone system offers (hopefully) most of Voice's features, and residential internet phone providers can fill in the other gaps. It could be a help to those who absolutely won't type out a text on a phone—but, then again, so can email.
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• Think Google knows too much about you: There's something to be said for breaking Google's personal data monopoly, and the tinfoil hat crowd have a whole new set of worries with Google Voice—your voicemails, calling history, and text messages are, after all, right on Google's servers, for who knows how long. It's not all that different from Gmail—Google breaking one user's trust could collapse the whole system—but it is something to think about.
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• Dislike Google's Contacts handling: Google Voice uses the same contacts database, so if its auto-inclusion of names you've emailed a few times drives you batty, well, you'll get the same results from Voice's Click2Call auto-completion. Only the names you've stored phone numbers for show up on Voice's dial feature, but we'd like to see a way to set a "primary" number that's the default when you're typing out a name.
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• Get annoyed at voice delays: Early Google Voice users (myself included) are noticing an audio delay on certain calls. Sometimes it's ever so slight, like a wonky cell phone connection. Sometimes you and the other party are toppling over the ends of each other's sentences. Google is certainly aware of it, but since it's a service that inserts a server as the middleman between parties, there might be an inevitable bit of latency on Google Voice calls, as there is with most international calls. If you've ever switched carriers because of voice quality or connection problems, you might find a new antagonist in Google Voice.
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• Really don't want to write another "New number" email: As noted above, Google's rumored to be working on offering number portability/integration for Voice. In the meantime, Voice users have to ask their friends, acquaintances, and business contacts to save a new number, figure out how to deal with the stragglers, and, in all honesty, hope the service isn't abandoned by Google anytime soon. If you live and die by your availability and can't stand the idea of being late to return even one call, switching numbers just won't fly. Everyone else has to make the call.

The trend piece doesn't even get into voicemail, which we've established everyone but old people hates. But it explores the clash between people who text too much and too little. Elizabeth Fishkin, an advertising professional, thought she was a big texter, and dumped a guy who ignored her text messages, until she met a Twitter fanatic:

Nothing obsessive, maybe five times a day — she just likes the ease, the directness, the speed of the medium. Texting is her language.

"I thought, if this is going to be such an issue . . . " she says.

Months later: another date, another guy, another technological incompatibility. This time she was out with someone who wanted to text . . . everyone.

"He kept talking about Twitter." Fishkin rolls her eyes. "Ashton Kutcher. Twitter, Twitter, Twitter."

And what did it mean when Mary, the Drew Barrymore character in He's Just Not That Into You, got asked out via MySpace? That would be a dealbreaker for Marc Houston, another young single profiled in the story:

"No cellphone?" Houston cannot fathom a relationship like this. He would never, for example, date someone who refused to text. And someone who was still on MySpace instead of Facebook? "Oh, that would be an automatic reject," Houston says. "It's kind of like a unibrow." He pauses. "Maybe that's why I'm single."

Yes, that sounds about right. This story isn't really about technology. It's about neurotic thirtysomethings who will find some reason not to be in a relationship. And perhaps that's for the best: If you can't even agree on the medium through which you'll communicate, is there any chance you'll ever be able to work through real issues?

No wonder AT&T is taking so many steps to make life difficult for people who try to buy an iPhone without a contract. Some bloggers are fussing about the fact that AT&T will no longer offer a prepaid plan for those with poor credit. What about those solvent enough to deserve an iPhone 3G? After AT&T and Apple get done with them, I wonder what their credit rating will look like.

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