Select your localized edition:

Close ×

More Ways to Connect

Discover one of our 28 local entrepreneurial communities »

Be the first to know as we launch in new countries and markets around the globe.

Interested in bringing MIT Technology Review to your local market?

MIT Technology ReviewMIT Technology Review - logo


Unsupported browser: Your browser does not meet modern web standards. See how it scores »

{ action.text }

Try me: You can use Loc-Aid’s demo page to test how well its service can pinpoint your location.

AT&T is using Loc-Aid to offer school districts a way to track students with a history of truancy. Other trials are using the technology as an alternative to tracking parolees with GPS anklets, which can easily lose signal when indoors.

Current trials focus on applications where there is real money at stake, because each location lookup costs money, and Loc-Aid passes on that cost. However, Gerber says the cost of location fixes is set to drop, and that carriers are working to dramatically improve how accurately they can locate phones. This could open up new ways for the service to be used, for example in mobile apps and other services used by consumers as a less battery intensive alternative to GPS.

“Next year, carriers will begin to offer new levels of mapping where they will be able to know where a device is to within a five-meter accuracy in some places,” says Gerber.

Exact details of how this will be achieved have not been made public, but Gerber says that cell companies could be thought of as “doing war driving on their own network.” War driving refers to the practice driving around while noting the characteristics of wireless networks in different places. The results can be compiled into a database of signal strengths for different locations that can be used to work out a device’s location from what it can detect around it. Apple controversially had iPhones “war drive” Wi-Fi data to boost its own location database.

André Malm, an analyst with Berg Insight, in Gothenberg, Sweden, agrees that the cost of locating mobile phone users in this way is likely to drop. “They are using these legacy systems today but will add new ones that support very high numbers of lookups,” he says.

As the cost drops, consumer-facing apps and websites could also start using the technology, says Malm. “When being located doesn’t have to be instigated by the user opening up something on a GPS device, [then] apps and Web-based services can try new things.”

Vincent Blondel, a mathematics professor at Université catholique de Louvain in Belgium, who researches extracting useful data from call and location records from cellular networks, says that Loc-Aid is opening up access to data that usually remains inside wireless carriers. “Location data has enormous value,” he says, although companies are still trying to work out how to put an exact figure on it. “The value may depend on the time of the day, and perhaps also on location,” he says.

Loc-Aid’s Gerber acknowledges that such data must be handled carefully. “Subscriber permission to use mobile location will only continue if users trust the apps, the carriers, and all players in the mobile ecosystem,” he says. However, Blondel says recent research suggests it can be very hard to truly anonymize location information.

Seeing the amount of location data that wireless networks record about customers can be surprising, say Blondel, citing the striking maps obtained by German politician Malte Spitz, who requested access to the location data recorded by his cell-phone network provider.

7 comments. Share your thoughts »

Credits: Loc-Aid

Tagged: Computing

Reprints and Permissions | Send feedback to the editor

From the Archives


Introducing MIT Technology Review Insider.

Already a Magazine subscriber?

You're automatically an Insider. It's easy to activate or upgrade your account.

Activate Your Account

Become an Insider

It's the new way to subscribe. Get even more of the tech news, research, and discoveries you crave.

Sign Up

Learn More

Find out why MIT Technology Review Insider is for you and explore your options.

Show Me