I have a phone outside my home. I want to change the wiring so that no unauthorized person can use it to call long distance

What country is this in, What do you mean by "phone outside my house" I have a picture of a phone hanging on the wall outside of the home

You need a toll call restrictor such as this one: Aaron's TCR

A Toll Restrictor is what you need, you could just use a switch.
I take it, it is OK for People to make Local calls?

Thanks people, someone else answered with like responses...

Thanks people, someone else answered with like responses...

Closed,