Earlier quoted context omitted.
Yeah this was big among my age group in Australia too, in the late 80s early 90s. Pay phones only charged if the other end picked up, so it was an easy way to tell dad to pick you up or that you’d be late.
When I was young I used to use the 1800-REVERSE number, which would require the person answering the phone to pay. I thought it was a great way to contact my parents if I had run out of phone credit.
The trick was to say that your name is "come pick me up mom" or something like that.