Despite an announcement of new leadership today, billionaire activist investor Carl Icahn is renewing his pressure on Motorola, calling for the break-up of the cell phone maker on Friday.

Earlier today, Motorola announced current Chief Operating Officer Greg Brown would be the replacement for current Chief Executive Ed Zander in January, a move Icahn welcomed.

I believe that the steps announced today do not even begin to address the major problems at Motorola, Icahn said. He holds about 3 percent of the company.

In my opinion, Motorola should be split into separate companies: a mobile devices company; an enterprise mobility company; a connected home company; and a company focused on mobile networks infrastructure, he said, according to Reuters.