Jazz trombonist Nadav Nirenberg says he left the phone in a livery cab on New Year's Eve. The next morning, the 27-year-old learned via email that someone was sending messages to women using a dating app on the phone.
Nirenberg logged on to the service and offered the man a date -- posing as a woman. He even posted a picture of a pretty girl.
When the culprit arrived at Nirenberg's Brooklyn apartment building with wine, the musician greeted him with a $20 bill while holding a hammer -- just in case.
The thief handed him the iPhone and left without a word.