"Hell if I know. Call someone, perhaps? It is supposed to be a phone, is it not?"
Who would Maxwell even call...?
"I've been told I can pay with it, among other things." So far, everyone's been gracious enough to handle that process for him when he's wanted to make a purchase.
"I suppose the first step would be to understand what it is actually used for. You have one, too, yes?"
"What're you trying to do?" Brad's not the most social, and generally doesn't care about others, but...
He can emphasize with a fellow grumpy old man.