Here is a recommendation. If you spent all the time that you have been looking for/worrying about this lost iphone 4s actually working at some job (even a college student type job), you would have already paid for a new one by now. The iphone is the hottest piece of tech on the planet, especially in NYC - land of the over privileged. People have them stolen right out of their hands on the subway every day so its hard to feel bad for you when you actually left it somewhere and expect it to get returned, highly unlikely. Your iphone is long gone - start planning on how you are going to replace it. Give law school a shot - bill 2-3 hours to a client and you will have your phone back.
I'll bet he would've spent more time trying to find a job (that means NOT working/getting paid) than he spent looking for his iPhone.