Protip for people who live in hot places: go to the park when the sun is going down and it cools off a bit. There'll still be five thousand people in most parks all night so it should be safe enough (at least, that's been my experience so far).
re: phone bills. The game doesn't seem to take that much data. My carrier is T-mobile and they're giving free data for Pokemon Go for a year so...score...
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