A Java port of the game is currently available for compatible mobile phones.

The growing popularity of the system is compelling other manufacturers to make compatible phones.

The company's Web site, futuredial.com, has a list of compatible phones.

The producers of the reader are very involved in developing solutions to increase the number of compatible mobile phones.

This allows anyone with a compatible phone to load their own ring tones in without a data cable.

At that Web page, you can also sign up for e-mail notifications of newly compatible phones.

A list of compatible phones and other information is at www.gameloft.com/totallyspies.

Can they be used by people that don't have compatible phones?

Sony Ericsson will bring this subscription plan and compatible phones to other carriers around the world starting in early 2009.

Subject to security settings, any compatible phone would have the same response when tapped on the Tag.