hi, i bought iphone 7 model A1660 1 year ago in Hong Kong and its service stopped. i read online that Apple suppose to replace my iphone and i wanted to know if i can replace it in NYC?

If you go onto the apple site and go onto support, you should be able to live chat with a representative who will be best placed to advise you, and if appropriate, book an appointment for you at the NYC store that best suits you.

Read what the warranty policy states.

If you have the receipt / apple care status, you can go to any apple store to get help.