Say it the way you'd say it to a friend. You don't have to phrase it any special way.
From any phone — mobile or the one on the kitchen wall. Nothing to install.
"Hi, I'm A.I. What can I help you with?" Then just talk. Take your time.
It answers in plain English. Ask it to repeat, or to slow down, as often as you like.
This line is for questions, not emergencies. It isn't a doctor, a lawyer or a financial adviser, and it will tell you when a question needs a real one.