"People here know to call a car service if they need a ride."

Do you know when to call the doctor about flu?

"Does he know to call you if he's going to be late or to get permission to go to a friend's house?"

I'll let them know to call you when they're in the area.

Dad never asked him how Mom knew to call that number, either.

And since they did not know what else to call him, that had become his name.

I don't know what else to call it but character.

It also helps you know when to call your doctor.

Another has three or four people who know me to call, in addition to him calling himself.

We didn't know to call them, but they were things of a different wing.