I found an a iPhone from sprint(i think)?

I found a new iPhone, a pretty nice one I think. I want to return it to the owner but i can't even look at the contacts because they locked it(which i never understood because it doesn't help them). I was going to leave it but it was raining and the phone was getting wet. I think its from sprint and i see someone who has the owner on instagram(which i don't have or know how to use). I'm trying hard to get it back but i just don't know what to do with it and no one is calling. Any Suggestions? If someone call could i answer it without the password?

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