COO Chase Carey told investment analysts on Wednesday about Jamba: “We are pursuing a process to potentially sell that. We prefer to build businesses than buying them. It’s been the foundation on which we’ve built this business. It’s certainly what we plan to pursue.”A News Corp spokesperson subsequently confirmed to mocoNews.net: “Jamba is Fox Mobile Group.  So Chase’s comments refers to both.”

For the fourth quarter ending June 30, News Corp says it’s writing off $217 million from the value of its outdoor and mobile businesses, in impairment and restructuring charges; though it’s not clear how much relates to either of the two components.

News Corp bought 51 percent of the Berlin-based ringtones specialist for $188 million together with VeriSign (NSDQ: VRSN) in 2006, then bought VeriSign’s share in 2008 to form a bolstered Fox Mobile Group.

But integration has appeared difficult and late last year, mocoNews.net learned, Jamba’s executive ranks were gutted in a restructure, with CEO, COO, CMO leaving on top of at least 70 layoffs.

The ringtones market has slowed since Jamba’s heyday of Crazy Frog (pictured) and Sweety The Chick.