It's funny to think in another 20 years kids might see this movie and wonder what are those weird small rooms with phones that people go into all the time. And they have to pay money to make a call!?
I can already tell you that the idea that a phone number calls a house rather than a person is foreign to a 7-year-old.
Which is really as it should be. I also find it amusing when people are SHOCKED that a kid would have a cell phone. Sure, they don't need an extravagant $700 smartphone, but who needs a cell phone more? The adult with multiple credit cards, money, reliable transportation, and sits at a desk 8 hours a day with a telephone sitting right there on it? (and then commutes by comfortable car to a house that likely has a landline.. or at least used to when I originally formulated this argument)? Or the kid who rarely has access to a landline, no credit card, no transportation of their own, relies on others (school bus, parents, etc) for transportation to a schedule that might vary each day of the week, and who is much more likely to be "stuck" somewhere?