This is part of the picture. But IIUC Telstra is very keen to keep that "obligation". Why? Because along with it they 1. Are fairly free to decide where to put payphone (eg next time you are in the city, notice sometimes they are slightly impeding pedestrian traffic in the city), and 2. They are allowed to place and sell advertising on the sides which makes bank due to 1. Despite the above I love that my kid can just dial my number on any payphone, and they like prank calling me, and they have duly memorised my number .