Cell phone maker Motorola Inc. said Wednesday it will cut another 4,000 jobs as part of a plan to improve sagging financial and operational results.

The latest round of cuts means the world’s No. 2 handset maker has announced plans to eliminate more than 10 percent of its work force since the start of 2007, when it became clear that two years of strong momentum behind the popular Razr phone had collapsed.

The company already is in the process of eliminating 3,500 jobs as part of a two-year cost-cutting plan to save $400 million. Those layoffs, announced in January, are to be completed by June 30.

Motorola said it will save another $600 million in 2008 by cutting 4,000 more workers, prioritizing investments and putting controls on discretionary spending and general and administrative expenses.