Matthias Ringwald, a doctoral candidate specializing in wireless sensor networks in Zurich, Switzerland, launched a piece of software called BTstack Keyboard, which will let users use Bluetooth-enabled keyboards with their iPhones. The software is available through the unauthorized app marketplace Cydia for $5.

IPhones rely on typing text using a virtual keyboard on the display screen, an attribute that does not appeal to some people. The handsets have Bluetooth capability–a popular way to connect peripheral devices–but so far Apple (AAPL) has only allowed it to be used to connect with other iPhones to play games or with certain accessories like headsets. Ringwald was one of the users frustrated by the limitation. He spent eight months developing the software before releasing it on Wednesday.

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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.

At first glance, this should be easy. The iPhone uses the same hardware ports as the iPod, which has attracted thousands of accessories. And the iPhone uses a modified version of Apple’s Macintosh operating system, which runs numerous small programs called “widgets” that would be perfect for the iPhone.

But, in fact, using add-on hardware for the iPhone will, in many cases, require buying new gear, or at least adapters to make the old iPod gear work, because of subtle differences in the way its hardware ports work. And there is no way to load Mac software onto an iPhone — even widgets. So you have to access iPhone-specific software through the phone’s built-in Web browser.

I have been testing some of the very first crop of iPhone add-on hardware and software. Some work well, others not so much. I expect to return to this topic when the add-on market is more mature, but here is an early look.

Most of the first hardware accessories are cases and headsets, for both music and phone calls. I didn’t test any cases, though I liked the look of one from Belkin, called simply the Acrylic Case, because it has a kickstand on the back that makes it easy to watch videos on the iPhone without having to hold it upright. It costs $30.

A good guide to third-party iPhone cases, headsets and other accessories can be found at ilounge.com. Apple’s own limited selection of accessories can be viewed at apple.com/iphone/accessories.

Many headphones for the iPod won’t work on the iPhone, because its headphone jack is deeply recessed and the connectors on even expensive headphones just can’t reach in deep enough. Belkin sells an $11 adapter to solve this problem. I tested it with my expensive Shure iPod headphones and it worked.

The bigger problem is that even the costliest iPod headphones lack a microphone and a call-answering button, so they can’t handle the dual functionality of the iPhone — listening to music and conducting phone calls.

Apple includes such a combo headset with the iPhone. It looks like the standard white iPod earbuds, but includes a tiny controller, embedded in the right earbud cord, that incorporates a microphone and also acts as a button. Push it once and it answers calls or ends them. When playing music, a single push pauses a song and a rapid double push skips to the next song. I found these Apple earbuds worked very well and were much more comfortable than Apple’s old iPod earbuds.

If you want to use your existing third-party earbuds or headphones, Shure will begin selling in August a $40 adapter called the MPA-3c. It not only fits the phone’s recessed jack, but also includes a microphone and control button that works just like Apple’s. I tested it with several iPod earbuds, from Apple and others, and it worked fine, though the mic is very low on the cord and must be clipped higher up on your clothing to work optimally.

Altec Lansing has several iPhone-compatible wired headsets in the works. I tested one, the $90 UHS306, due in August, and liked it a lot. It doesn’t require any adapter and it has a combination microphone/control button mounted high up on one cord, plus a second cord-mounted controller for volume adjustment and muting.

Plantronics also plans several wireless Bluetooth headsets to work with the iPhone. Most existing Bluetooth headsets should also work, but only for phone functions. The iPhone doesn’t currently support playing stereo music through Bluetooth. I tested a new Plantronics Bluetooth headset, the $130 Discovery 665, and it worked well. It is available now. Apple will also be bringing out its own Bluetooth headset for phone calls for $129.

Many accessories, such as car audio kits and home speakers, that worked with the iPod’s bottom connector, will require a simple plastic adapter for the iPhone to fit into them. Apple sells these for $9 for a pack of three.

Other accessories that use the iPod connector won’t work right on the iPhone because they don’t reroute the sound from its speaker, a feature the iPod lacks; or because they aren’t properly shielded against interference from the iPhone’s transmitters. New versions are likely to be rolling out. These will display an Apple-endorsed label that says “Works with iPhone.”

I also tested about a dozen add-on iPhone software programs. Most were either rudimentary, pointless, or worked poorly.

There were two that I liked a lot. One is a Sudoku game, at sudoku.myiphone.pl. The second, at showtimes.optimalconnection.net, lets you look up movie show times in any zip code, and links to the phone’s Google Maps program and to the Fandango ticket-buying site.

Still, the whole system of running programs through the browser is more cumbersome and less satisfying than if you could directly install them on the phone.

You can find a growing list of iPhone software at iphoneapplicationlist.com.

• Email me at mossberg@wsj.com. Find all my columns and videos online for free at the new All Things Digital Web site, http://walt.allthingsd.com.