You won't get into legal trouble, but there will be consequences if you're caught...
Locate the state, then the city or county where you think they are being held.
You cannot get in legal trouble for accepting a phone call from an inmate using a contraband cell phone, however the jail or prison may deny you future phone calls from the inmate or visits to the facility if you get caught.
Begin your search for an inmate or arrestee, or locate any jail or prison here: