A 40-year-old Lapeer County man beat his girlfriend with a cell phone, bound her with duct tape and held her captive for about nine hours because of text messages from a friend, authorities said.

Michael Nordstrom on Monday pleaded not guilty to charges of domestic violence and unlawful imprisonment.

The sheriff's department said the woman told investigators that her boyfriend bound and beat her with the phone and his fists after reading text messages Sunday afternoon at the home they share in Goodland Township. The 39-year-old woman escaped late Sunday to the police department in nearby Imlay City, about 45 miles north of Detroit.

Nordstrom didn't have an attorney on record with the district court. A preliminary conference was set for Jan. 5.