Grandma probably doesn't text and won't use much data. Some members on my family plan use < 100MB/mo. More realistically, she already has a plan with a monthly

Grandma probably doesn't text and won't use much data. Some members on my family plan use < 100MB/mo. More realistically, she already has a plan with a monthly payment. Which she is not even considering at this point. All she cares is how much it will cost her right now. $100 could make a difference.