My Dad recently got my Mom an iPhone. She promptly went over her data minutes. Whomp whomp. They quickly upped the plan so that wouldn't happen again. I don't think Dad realized how much an iPhone actually costs on a month to month basis when he got it.

My MIL has a cell phone but it's just a regular old flip phone. She hardly ever uses it. It's one of the pay as you go phones.

Do your parents have smart phones?