Roman, EJ and tracing calls

O.K., How is Roman going to "trace" a phone call from EJ to Nicole? EJ is the caller, Nicole has a cell phone. You usually trace a call to locate the caller and with a cell phone, I don't think you're really tracing the call. Maybe they need to watch 24 and learn some new lingo. I think the workd is "triangulate" the call so that they could try and pinpoint Nicole's location. I know I'm being picky, but that just hit me the wrong way and it made Roman sound stupid.