Avoid the car at the start of the mission, then search in front of the burnt 
  out car to find a phone.
  Immediately after entering the underground parking garage, enter the office on 
  the left. The phone is inside.
  Go to the rear and right of the underground parking garage. There is another 
  office with a phone inside.
  After leaving the parking garage, hack the door, and go inside. The phone is 
  in the kitchen area to the right.
  Leave the burning kitchen, and enter the dining room. The phone is inside the 
  closet at the far end on the right.