Some of them are pretty expensive. [He gestures with the phone.] This would would be pretty pricey, but there are less complicated one's that don't cost as much.

[And now Sofia is asking him more complicated questions. Very honestly:] I'm not actually sure how the phones are working here. You usually have to have big towers for the messages to get from one place to another.

But that symbol is called smiley face. You can use it to show that you're happy, or joking. Uh... [He goes back to his phone and quickly sends Sofia another message: :(] That one is for it you're upset.