It wasn’t in the initial release. Needed a software update 2 months later or so.
You were only supposed to get 1 year (?) of service. But they extended that by a year.
Because of that everyone with a qualifying phone is still in the “free” stage so we still don’t know what it will cost. Or when that will start.
If ever.
I’ve never used it but I like that my iPhone has it. I would never carry a Garmin (city/suburb life, no point) but I know the satellite is there if needed.
I think Apple is expanding it to iMessage this year (text only) though for all we know that will cost extra.