GameSpot is reporting that the same company that has made mobile versions of Microsoft games such as Midtown Madness 3, Zoo Tycoon 2, and Age of Empires 2, has acquired the rights to make mobile Halo properties and is working with Bungie to figure out what kind of applications to make:

At the CTIA IT Wireless and Entertainment 2005 trade show today, mobile game publisher In-Fusio announced that it had secured a three-year agreement with Microsoft for the mobile rights to the Halo universe. The company has also announced that the first Halo-inspired applications for phones are due later this year on North American carriers, with other regions to follow.

This will, of course, not be a version of Halo to be played on mobile phones, but most likely some other related applications.