I was looking at stuff about my LS, and I noticed that there is a phone option on the LS.. Is this true? has anyone have it? or how does it work? Can anyone get it?

I was looking at stuff about my LS, and I noticed that there is a phone option on the LS.. Is this true? has anyone have it? or how does it work? Can anyone get it?
I believe it was part of a early package that was later dropped. I used a motorola analog phone and never really lived up to the 'on-star' expetations.