[Naoto watches the girl for a moment before realizing that she does not seem to know how to work a cell phone. She tries to offer a helpful but quick tutorial on how to send instant messages which Sakura seems to understand more or less.]

If we get separated and you become scared, just send me your location over text. Or you can press this button [Naoto indicates the green call button with her finger.] to speak with me over the phone. Either way, I'll come find you as quickly as I can, okay?