It's your dime.

I am sitting watching Youtube, binging on
"r/IDontWorkHereLady", when a call comes in. I can see it is my youngest daughter. I answer, "It's your dime.". She said, " What did you say? ". "I said it's your dime.".
She says, "What does that mean?"
Then it dawns on me. I had my first Motorola cell phone four or five years before she was born.
I have to explain. I'm not sure she has ever seen pay phone. I am just getting too old.
my wife's Grandma says "it's your nickel".... my my have the prices jumped! LOL