call about (something)
To call someone by phone to discuss a particular person or topic. A noun or pronoun can be used between "call" and "about." Hi, I'm calling about the ad I saw in the paper. I have no idea why the street is closed, but I'll call Laura about it—she knows everything that goes on in this town.
call someone about something
to call someone on the telephone, seeking information about someone or something. I'll call Maggie about Ted and see what she knows. Let me call the manager about this.