Marc and Oliver Samwer, the brothers who launched German mobile entertainment company Jamba, have exited the firm.

Marc and Oliver Samwer, the brothers who launched German mobile entertainment company Jamba, have exited the firm.

According to Jamba, the co-managing directors will stay on as consultants until June 2006. The Berlin-based company cites personal reasons for their departure.

Deputy managing director Berger-de León and finance director Dirk Hoffmann step up into the managing director roles.

Jamba is recognized as the European firm that made the sale of ringtones a mainstream business, in part through mass-market TV advertising campaigns. The company was also behind novelty act Crazy Frog, the first ringtone-based hit.

Established in 2000, the company was sold four years later to U.S. Internet company Verisign for a reported $273 million in cash and Verisign stock, but the Samwer brothers stayed onboard.

Jamba currently has 520 employees and sells more than 50,000 products for mobile phones-including music, games and wallpapers-through its Web sites. It has operations in more than 20 countries. Billboard recently rated Marc as one of the 20 top global executives in 2005.