AT&T IPhone Billing? What's charged and what's not?

I'm on vacation and, the place I'm staying Does not have home Wi-Fi. I want to play Subway Surfers but, I'm afraid it will be charged to my bill. I'm NOT playing with friends on it.So. I'm very curious.
My carrier is AT&T.

If you're not playing with friends does it still require internet to play? You could turn on airplane mode to be sure not to use data. But you wouldn't receive calls or texts with it on. So be sure to turn it off when you're done.

You don't need data if you're not challenging, but if you tap into your data without an international plan you'll pay $20 a mb… Thank will break the bank

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