Apple Inc.’s much ballyhooed iPhone was unveiled this week after 30 months and millions of dollars in top-secret development. But the 
sleek new iPod-cell phone combination could wind up costing the company a lot more. Cisco Systems Inc., the world’s largest networking equipment maker, sued Apple in U.S. District Court here Wednesday, claiming that Apple’s iPhone violates its trademark.
Cisco is asking the court to forbid Apple from using the name "iPhone," which Cisco has held a trademark on since 2000 and used to brand a line of its own Internet-enabled phones that began shipping last spring and officially launched three weeks ago. ABC News: Cisco Sues Apple Over Use of iPhone Name