A less talked-about issue is the fact that many smartphone apps are constantly pinging the network, like a kid asking his or her parents every few seconds, “Are we there yet?”

Only smartphone apps are even more annoying. Some ping the network as often as 2,400 times an hour. The result is network congestion and signal loss, as well as a far more rapid drain on battery life.

“Wireless signaling is a tricky topic because oftentimes it’s hidden, happening in the background without any user knowledge. But it’s growing bigger by the minute, as more users download more connected applications” said Isabelle Dumont, head of marketing at Seven Networks, which pitches a solution to help reduce the issue.

If current trends continue, the constant pinging of the network could eventually amount to 25 trillion signaling events per hour, Seven says.

The company, which has a product designed to reduce some of the noise, has put together a handy infographic on the issue, a portion of which is included below.

Update: One of the the things we were wondering was just how much difference there is among platforms, since much of Seven’s graphic seems to relate to Android.

“Whether it’s Android, iOS, or Windows Phone, they tend to be always-on, checking for content updates on a frequent basis, even if there is no content update to be delivered,” Seven said. However, there are some important things that make over-pinging a bigger issue on Android.

One, lots of apps operate all the time on Android. Also, Seven notes, “Many more apps on Android monetize through advertising, which by itself can be one cause of additional data and signaling traffic.”

Also, Google’s store allows all apps to be published, regardless of how “noisy” they are.

“By contrast, there appears to be much tighter control on the iOS side,” Seven said. “Any app on Android can operate in the background and take advantage of all services and APIs available on the operating system and the device. iOS comes with a much tighter control over which app can operate in the background and be ‘always-on.’”

As for Windows Phone, Seven said, “These devices are still in the early stage of adoption, and because of the relative low volume of applications available for Windows Phone, the signaling storm related to Windows Phone has mostly been ignored if there is one.”

In addition, as a developer reminded me in an e-mail, Windows Phone today just does a whole lot less in the background and has a different means for getting updates (pushed down vs. polling).

In some cases, such as with Skype, there are some downsides to the way apps can live in the background, but it does make them potentially far less noisy.

Movity was founded this year, with $1.3 million in funding.

Here is the full press release, along with some real estate news about Trulia’s new HQ:

TRULIA ACQUIRES MOVITY TO ACCELERATE AND ENHANCE THE ONLINE REAL ESTATE EXPERIENCE

Trulia Moves into New 30,000 sq foot Downtown San Francisco Location as the Company Continues to Grow at a Rapid Pace

SAN FRANCISCO, December 21, 2010–Trulia.com (www.trulia.com), a top site for homebuyers, sellers and renters, acquired Movity (www.movity.com ), a stealth start-up focused on surfacing geodata to help new movers make better decisions and creator of social check-in tracker www.weeplaces.com. Movity was part of the Winter 2010 YCombinator class and the team includes Eric Wu, co-founder of RentWiki.com, Sha Hwang, design technologist from Stamen Design, Vaughn Koch, program manager from Bing, and Zain Memon, a contributor to the open-source framework Django.

“The consumer real estate experience will continue to change dramatically and we believe adding this team of talented individuals will accelerate our innovation and growth,” said Pete Flint, CEO and co-founder of Trulia. “Movity brings strong engineering skills, visualizations specialists and a passion for real estate. We looked at their vision and our vision and we knew we had a perfect match.”

“We are excited to join a leader and innovator in the real estate market and contribute to a world class engineering organization,” said Eric Wu, co-founder of Movity. “I’ve been impressed what Trulia has accomplished in the past few years, and together, we want to change the way people discover local information and find a place to live.”

New Office Space

In 2010, Trulia doubled the size of its workforce and today moved in to a new 30,000 sq foot office in the heart of SOMA in downtown San Francisco. Trulia occupies multiple floors and built the space to include user experience testing rooms, 27 conference rooms and a handful of cool design elements including bike racks, a library and open collaboration spaces to foster an environment of innovation and collaboration.

“About 18 months ago we asked our employees what they wanted in a new office and it was pretty clear they wanted to be closer to public transportation, they wanted a bright open office and they wanted to be in the center of the activity downtown,” said Sami Inkinen, COO and co-founder of Trulia. “We took their feedback and we found an office that meets all our needs and allows for future growth opportunities. Moving into the new office today you could feel the sense of pride in our employees and this begins another new and exciting chapter in Trulia’s history.”

In fact, the Bay Area unit was one of the first parts of Nokia that CEO Stephen Elop visited when he took the job earlier this year–in part because the company’s board had already scheduled to have its meeting in the area.

Silicon Valley has slowly become an important spot for the company, despite the fact that Nokia doesn’t sell all that many smartphones in the U.S.

Earlier this month, the company’s area employees got a new home as Nokia consolidated nearly all of its Bay Area workers in new offices in Sunnyvale (see picture above). Each floor of the Finnish-style interior has self-standing structures that from the outside look like saunas, but are actually “privacy huts” used for small group meetings or just some alone time pondering the ins and outs of the cellphone business. Nokia kept its research labs in Palo Alto and Berkeley so they could stay close to the area’s top two universities.

The local staff is doing a range of different things. About 50 of Nokia’s Silicon Valley employees come from the company’s 2008 purchase of a Norweigian company called Trolltech, which makes an application platform called QT that is used to control everything from phones to trains and more.

There are also a variety of individuals and small groups working on various product and research efforts. Kari Pulli is a Nokia Fellow who focuses on camera technology. He helped develop a panorama photo feature that is part of the latest Nokia cellphones. His team also developed an HDR photography capability–a feature Pulli reminds people was added to Nokia’s phones before Apple included it in the iPhone. He said his team is currently working on techniques to improve cellphone pictures taken in low-light conditions.

Typically, such photos are either noisy or blurry, depending on what step is taken to compensate for the lack of light. But by taking two pictures–one picture that aims to be sharp, though noisy, and another that will be a bit blurry, but have low noise–he said that a better composite image can be created.

Pulli, who was born in Finland but has spent the past four years in Palo Alto, said he is not too worried that the new Nokia chief is not Finnish. “At least he’s Canadian,” Pulli said, pointing out it’s another cold, dark place that loves hockey. (Elop does love hockey.)

While some of Nokia’s workforce is building new features, others are working on making sure that the company has partnerships with all the important companies in the valley–especially the Facebooks and Twitters of the world.

As for the research projects, they vary widely, and many are only tangentially related to Nokia’s core phone-making business.

Tico Ballagas is a user experience researcher working on how to make technology a better tool for family communications. So he’s been spending a lot of time with Elmo as part of a Family Story Play project to see if distant relatives can better connect with young relatives by reading a story to them over videoconferencing gear.

Meanwhile, Jorg Brakensiek is working with a number of German carmakers to develop a framework known as Terminal Mode, which would allow all manner of smartphones to be usable within cars without users having to stare down at a screen to make use features like maps, email and more.

What many at the offices lament, though, is the fact that so few of the people in the U.S. get a chance to appreciate their work. While Nokia certainly has its challenges globally, it is all but invisible at the cutting edge of the U.S. market. that’s because none of the major carriers here sell a subsidized model of the company’s high-end phones.

What’s worse, the phones that the carriers do sell tend to be the most basic and boring of cellular designs. The company has plans to change that next year, when it hopes the introduction of Meego-based phones will finally sway U.S. carriers to offer subsidized Nokia smartphones, ideally by next summer.

Or the toilet.

“For us, apps are all about adding real value to the end-user’s life and creating revenue for developers,” Alan Panezic, RIM’s VP of platform product management, said at the 2010 BlackBerry Developer Conference this week. “We don’t need 200 fart apps in App World. Those are apps you’ll use three or four times then never open again. You’re not looking at ads, clicking on ads or buying premium upgrades, and the app isn’t adding any value to your device.” (Which is exactly what Apple (AAPL) said earlier this month in its new developer guidelines.)

So RIM (RIMM) envisions a BlackBerry App World that’s all signal, no–ahem–noise. But signal and noise are not mutually exclusive. And, as iOS developer Joel Comm will tell you, sometimes that noise can be very lucrative. Comm made nearly $30,000 in one day–from a 99-cent fart app. How many mobile developers redoubled their iOS efforts when they caught wind of Comm’s success in the New York Times? How many new developers began writing apps thinking they could score a similar payday?

Ultimately, RIM just needs more apps, and more that reach beyond the enterprise space. If it has to suffer through a fart app onslaught to get there, who cares? Users will either buy them or they won’t. If they do, that’s money in the pockets of the devs who made them and great encouragement for others who might write software for the platform. If they don’t, it’s great encouragement for devs to try again with a different app.

In the end, RIM just needs to build developer interest in its platform. And issuing mandates about what sort of apps it “needs,” seems a poor way of doing it.

And who knows? maybe enterprise wants a good fart app.

“A Google approach to sharing,” Buzz is designed to, in the words of Bradley Horowitz, VP of Product Management, “find the signal in the social networking noise.”

The service exists within Gmail and promises to bring the social network that Google (GOOG) says always existed beneath the email service to the surface.

“The stream of social messages has become a torrent,” said Horowitz. “There is no way to parse that amount of information that ranges from the ridiculous to the sublime. We think this has become a Google-scale problem.”

Hence, Buzz.

Buzz taps into the torrent via the sort of feature set you’d expect: auto-following, which turns Gmail contact lists into social networks (which seems to me a horrifically bad idea; Like most folks, I imagine I have quite a few contacts I absolutely do NOT want to included in my social network); public and private sharing options; support of the “@ reply” feature popularized by Twitter; and a feature called “Recommended Buzz” that allows users to endorse updates they enjoy. The service also strives to make it easy to enhance those updates with content from other sites–Flickr, Picasa, YouTube and, yes, Twitter (no Facebook, though–yet).

Buzz, which launches Tuesday, is closely tied to Google’s mobile ambitions. It will debut in concert with a Web app for Android and iPhone and an enhancement to Google Maps for Mobile that will use GPS data to associate public Buzz content posted from mobile phones with location.

Google is the latest search company to try to graft social-networking features onto email service. Yahoo did it last year by adding “status casting,” its variation on Twitter, to Yahoo Mail. That feature has been mostly ignored since its debut. Perhaps Google’s effort will fare a bit better. It is, perhaps, the one company with enough heft and market power to reasonably take on Facebook. But it won’t be easy: Facebook has some 400 million unique users. Gmail, about 176 million.

Still, embrace and extend. Embrace and extend.

Wireless cellphone earpieces can make people look faintly ridiculous as they stroll down the street or around the office, seemingly talking to themselves with ugly appendages sprouting from their heads. The pulsing blue lights on these things can make people look like robots. And these battery-powered gadgets, which use a power-hungry wireless technology called Bluetooth, are just one more thing to charge.

But such headsets are becoming more necessary, at least in the car. A growing number of cities and states are requiring all calls made while driving be conducted in a “hands-free” manner. Two more big states, California and Washington, will begin enforcing such laws in July. Unless drivers in these places have cars with costly built-in Bluetooth speakers and microphones, many will turn to wireless earpieces to make calls legally.

Now, two of the most important wireless earpiece makers are bringing out new models that attempt to make their products more attractive and functional. One is a new version of the Jawbone, which has become a leader in the high-priced end of the market. The other is a new model from Plantronics (PLT), which vies with Motorola (MOT) as the top seller of wireless earpieces.

I’ve been testing both the new $130 Jawbone, and the $150 Plantronics Discovery 925, and both work well, despite some drawbacks. Each worked properly with both an inexpensive Motorola Razr phone from Verizon (VZ) and a sophisticated Apple (AAPL) iPhone from AT&T (T). But I preferred the Jawbone, because of its technology and design.

The new Jawbone, made by a closely held San Francisco company called Aliph, is 50% smaller than the original Jawbone, which I reviewed in 2006. It continues to boast the original Jawbone’s signature feature: a remarkable ability to suppress background noise and isolate the wearer’s voice.

Jawbone performs this feat by using a sensor that touches your skin lightly to identify your voice through the vibration of the bones in your face. Using this information, its microphone can more easily distinguish your voice from background noise, and accurately suppress the latter.

This feature, originally called “Noise Shield” and now theatrically renamed “Noise Assassin,” really works. When the company first showed off the original Jawbone, it made live calls standing in front of things like weed whackers and boom boxes, and then turned the bone-sensing feature on and off to show the dramatic difference.

Aliph’s new Jawbone

In my tests of the new, much smaller Jawbone, I stood a few feet from a roaring vacuum cleaner, while on a phone call. The person I was calling could barely hear me with Noise Assassin turned off, but could clearly make me out when I turned it on.

By contrast, the Plantronics Discovery failed my noise test. It was useless anywhere near the vacuum cleaner. This was obviously an extreme case, but it served as a stand-in for other loud noises likely to be encountered in real life, like large trucks, or construction gear on the streets.

The biggest flaw in the original Jawbone, in my 2006 tests, was its performance in wind, which was poor. The Jawbone did much better in my latest tests. During a Jawbone call from a car with all the windows down and the sunroof open, my voice was easy to make out, according to the person I was calling. The new Plantronics earpiece did just as well in this wind test.

Plantronics claims its headset also enhances the voice of the person you are calling, a claim Aliph doesn’t make for the Jawbone. But, while voices sounded fine on the Plantronics, I couldn’t detect any difference between the two on that score.

Both gadgets are meant to be more stylish, and both will be available in multiple colors. But, while the Jawbone is just a smaller iteration of its original slab-like form, Plantronics has done something more radical with the Discovery 925: It has tried to make it look like jewelry. The Discovery’s electronics are housed in the diamond-shaped portion of the device that goes on the ear, and the microphone sits at the end of a long, V-shaped boom that is open in the center. Plantronics says the design is suitable for both genders, but admits it is a bit more aimed at women and at fashion-conscious men.

I believe some men wouldn’t feel comfortable wearing this new Plantronics model. It’s also longer than the Jawbone. But I did find it more comfortable to wear, since it doesn’t protrude as much into the ear.

The Plantronics claims longer talk time — five hours vs. four hours for the Jawbone, but the Jawbone claims longer standby time — eight days, vs. seven days for the Plantronics. The Jawbone weighs more, at 10 grams, compared with 8 grams for the Plantronics, but neither felt heavy on my ear.

I did prefer the Plantronics’ controls over the Jawbone’s. The former uses obvious buttons, while the latter employs unmarked, hidden buttons whose location you have to learn by touch.

Both of these earpieces do the job, but if you have to choose one, I’d pick the Jawbone.

• Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

Corrections & Amplifications:

The Aliph Jawbone cellphone earpiece weighs 10 grams, and the Plantronics Discovery 925 earpiece weighs 8 grams. An earlier version of this column erroneously reported the products’ weights in ounces.