If Callisto notices the frown, it certainly doesn't slow her roll. If anything, her smile gets bigger and more wicked, particularly when Eda takes her phone out. She'll even lean over her shoulder to peer at the screen.

"Does this phone have a function that makes it loud?"

Speakerphone. She's talking about speakerphone. She may have picked up some lingo, but her interest in learning the intricacies of tech has still generally been low.