Proceed until you enter a small alleyway with clothes hung up to dry around 
  it. Directly in front of you (before going up the stairs) is a walled area 
  with a seat. The phone is on the seat.
  Clear the courtyard, and the gates will open. Go through them, turn left, then 
  take the first right. The phone is on the ground next to the door.
  Once past the courtyard, follow Vespa, and cross the balance beam. There is a 
  phone on a chair as soon as you cross the beam.
  Kill the mercenaries, then cross the courtyard to reach some stone stairs 
  (bridge). The phone is on the left of the stairs in a flower bed.