They're not guns, but German cops are calling them the next best weapon to hunt down crooks - mobile phones.

More than 75% of Germany's 85 million-plus inhabitants own one. Many of them are taxi and bus drivers, delivery people and others who professionally spend a lot of time "on the ground." More so, in fact, than the country's police. That's why Germany's cash-strapped government has turned to its mobilized citizens for help in tracking down suspected criminals, fugitives and even missing persons.

In what is believed to be the first service of its kind in the world, citizens over 16 years old can now register with the Federal Office of Criminal Investigation (BKA) and become a volunteer mobile phone cop.

The service is based on registered volunteers receiving a brief  Short Message Service (SMS) message on their mobile phones from the police and calling back if they spot someone. A typical message could read like this: "Police searching for bank robber, male, approx. 30 years old, wearing jeans, black, leather jacket, driving black BMW sedan, Düsseldorf license number D-JJK-5511. Dial 110 with information."

Before launching the SMS search service, the German Interior Ministry authorized pilot tests for over a year with police departments in 10 cities. The results were overwhelmingly positive, according to Interior Minister Otto Schily, who last month approved a nationwide rollout of the service.

In a country battling rising crime, Schily said the new method could significantly improve crime fighting by enabling public-minded citizens to search for criminals or missing people. His logic: the more eyeballs snooping, the better the chances of catching crooks.

Interested citizens can register to become SMS-enabled "spotters" on the Internet by going either to the BKA Web page or directly to the special police SMS search portal. Here they find general information about the service and their role in the process, in addition to the registration procedure, which is simple and quick.

There is, however, a hitch for those worried about governments electronically compiling and storing information about them; the registration process requires everyone to provide a certain amount of personal data, including occupation and passport, which the police reserve the right to check for security reasons. This means, of course, that such data ends up in yet another IT system held by the Powers That Be.

The IDG News Service is a Network World affiliate.