—You don't know what a cell phone is?

[That's surprising, and he visibly lets it show as he reaches into his pocket and pulls his out. Where could she have— Wait. What if that isn't the question he ought to be asking?]

It is a type of telephone, but portable, and it can do a lot of other stuff too. You can browse the internet, check e-mail, take pictures, play games... Mine's not the latest, but it suits my purposes well enough.