a pay phone?

Ky ~ "Mommy, what is that box over there with the phone on it?"
Me ~ "It's a pay phone sweetie."
Ky ~ "Why would someone get out of their car and use that? They can just use their cell phone."
Me ~ "Well honey, everyone didn't always have a cell phone. When Mommy was a little girl, no one had a cell phone."
Ky ~ (after her eyes almost bugging out of her head) "Wow, you must be ooooold Mommy..."
DQ ~ (giggling in agreement) "Yeah, old."