But keeping those types of digital-photo frames up-to-date with new pictures demands more technical skill than many parents and grandparents are likely to have. It requires, for example, rudimentary knowledge of how to configure a home Wi-Fi network or shuttle storage cards between a frame and a digital camera. Still, digital frames are a great way to keep generations in touch with, say, a far-flung child’s latest ballet recital or a football game.

Just in time for the holidays, the wireless carrier T-Mobile is selling a digital-photo frame that makes it easy to set up and to keep fresh. While I found the Cameo excels in its simplicity, it comes with a number of annoying drawbacks and a pricing model that will limit its appeal. It sells for a reasonable $99.99 in T-Mobile stores, but carries a hefty $9.99 monthly fee.

Still, Cameo is an exciting first edition of a product.

First, its strengths. The picture frame is as easy to operate as a cellphone, containing some of the same technical innards of a wireless handset. And each Cameo has a unique phone number, just like a cellphone, that lets anyone who knows the number to “dial” it up — sending messages containing digital photographs instead of voice calls.

Setting up Cameo is as easy as taking it out of a box, screwing a stick into the back to prop up the frame and plugging it into an electrical outlet. The Cameo has a seven-inch color display and one of the more attractive borders I’ve seen on a digital photo frame: imitation black leather with white stitching.

Users themselves can manually load images onto the frame from a PC by connecting it through a USB cable or by inserting a miniature storage card from a digital camera.

Cameo can receive pictures wirelessly two ways. The owner of the frame hands out the Cameo’s phone number to friends and family members, who then send pictures to the frame that were taken with the cameras standard on most modern cellphones. This method uses MMS, or multimedia messaging service, a communications standard normally used to share pictures and other media between cellphones.

Cameo owners also can give out an email address for their picture frames that is based on their Cameo’s phone number, allowing people to email images that they’ve downloaded to their computers from digital cameras.

The first time the frame receives a picture from an email address or phone number, Cameo asks the frame owner to push a button on the back of the frame to place the sender on an approved list. After that, all images from the approved source appear automatically on the frame — a method that at least keeps random people’s photos from popping up in grandma’s living room.

There’s a wonderful unpredictability to how Cameo works. Imagine all of the kids and grandkids in a sprawling family room in different locations being able to send snapshots to each other. This is possible now with photo-sharing sites like Flickr, but those typically require going to a Web site. Images on a Cameo just show up without warning on your kitchen countertop, living room or office desk.

I handed out my Cameo number to some colleagues and was delighted when their cameraphone pictures began trickling into my frame, including a shot of the New York neighborhood in which one of them lives, and an image of another colleague ice skating.

The Cameo’s screen, featuring 720×480 pixels, isn’t the highest-resolution digital photo frame on the market, but the pictures looked fine to me. You can do a slide show for any number of images, chose a fade-out or other transition, change the order of the photos and alter the display speed — holding a single image for up to an hour.

Unfortunately, the frame has a skimpy 64 megabytes of memory, and storage capacity isn’t expandable. There is enough room for only about 200 photos at maximum size. Once it’s full, you have to make room by manually deleting photos.

Another problem is that the frame currently is available only to existing T-Mobile cellular subscribers.

By far, the biggest turnoff is the monthly fee for the cellular service that delivers the pictures to the frame. There’s no limit on how many pictures can be sent to a Cameo under T-Mobile’s cellular plan, but $120 a year is a steep price.

The carrier says it will consider other pricing options in the future. Until it does, it’s going to be tough for most people to buy the Cameo, even for a beloved family member.

Walt Mossberg is on vacation.

Write to Nick Wingfield at nick.wingfield@wsj.com

Now, Wi-Fi is making its way into your car. A small California company, Autonet Mobile, has teamed up with Chrysler and others to sell a service that floods any brand or model of car or truck with Wi-Fi Internet connectivity that can be used by multiple passengers and devices simultaneously. It’s a dealer-installed option on Chrysler vehicles, but Chrysler dealers, and some independent auto electronic shops, will install it on any brand of car for a fee.

The system works via a special wireless router, mounted in the trunk or rear cargo area, that draws Internet connectivity from cellphone towers and then converts it into an in-car Wi-Fi signal with a range of 100 feet. This router looks like a military device, because it is ruggedized to survive jolts and vibrations, and is shielded to avoid interference with the car’s electronics or with cellphone calls.

As long as they have built-in Wi-Fi, the laptops and smart phones used in the car don’t need any add-on hardware or software to use Autonet. To them, it looks like any other Wi-Fi signal. And no special car antenna is needed; the router uses its own large antennas.

I’ve been testing Autonet Mobile in a rented Saturn Vue SUV in Washington, D.C., and its suburbs, and found it worked well for most basic Internet tasks like email and Web surfing. The router turns on when the car does, and the Wi-Fi signal shows up about 30 seconds later. However, Autonet is relatively pokey. It’s too slow to be reliable for streaming video longer than brief YouTube clips, or for smooth video chatting.

Perhaps the biggest downside of in-car Wi-Fi is that it provides one more potential distraction for drivers. The company says the service is only for passengers, not drivers, but there’s no technical barrier to a driver using it.

The Autonet Mobile router

Of course, drivers already can court danger this way by using cellphone wireless connectivity on a laptop, iPhone, BlackBerry or other connected device. And that raises another question: Since you can already connect to the Internet from a car with a smart phone or a cellular data card for a laptop, why would you want Autonet?

There are three reasons. First, cellular Internet access is typically tied to a single device at a time. But Autonet’s Wi-Fi service works just like Wi-Fi in your house: Multiple people with multiple devices can use it at the same time. In fact, the company envisions that the service’s primary use will be to allow children in the back seat to use laptops for social networking, online games or homework; and multiple adult passengers to conduct online business or research routes and destinations.

Second, the monthly fees can be lower, at least for laptops. A typical cellular data card for a single laptop costs $60 a month. But Autonet’s service starts at $29 a month for the entire car, regardless of how many devices are being used. A premium plan costs $59. The plans differ by how much data you are allowed to consume monthly. And Autonet requires no special laptop cards or software.

Lastly, the company claims that it has invented a technology that keeps the connection steadier while moving than the typical direct cellular connection. Although some videos froze on me, I never lost Autonet’s Internet connection, whether moving slowly through downtown D.C. or moving faster on suburban highways and streets.

In my tests, with a laptop and an iPhone, Autonet’s speeds ranged from around 100 kilobits per second to around 500 kbps — far slower than a typical cable Internet service in a home. My average speed was between 400 kbps and 450 kbps.

There are some other drawbacks. First, the router costs $499, though that will soon drop to $399 in a holiday price promotion. Second, you have to sign at least a one-year contract, even if you pay monthly. Third, your Internet usage is limited. The $29 plan gets you just 1 gigabyte of data a month, while the $59 plan gets you 5 gigabytes. That should be plenty for most typical users, but not for those with large appetites for data.

These service fees are all-inclusive. You don’t have to pay anything to any cellphone carrier. But there is also a $35 “activation fee,” whose justification is murky, and installation costs are estimated at $50 to $75.

For security, you can set Autonet up with a password, but it doesn’t yet use the most advanced version of Wi-Fi security. The company says that, while it can track and manage your Internet connection, it cannot determine the content of what you are doing online.

Finally, because the router is hard-mounted, you can’t remove it for use in, say, a hotel room or second car.

If you’re willing to invest in the router and can tolerate the slow speeds, Autonet might be what you want — as long as you can resist using it while driving.

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.

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