Also send your phone a text saying "if you find this phone, please call xxx-yyy-zzzz.". My husband lost his phone and I texted his phone. By the next morning Security at Madison Square Garden in NYC was calling saying they had his phone. Most people do not know what to do when they find a phone. Also when you do find it , put in your contact list " cell phone owner" with an alternate phone number.
Perhaps someone found your phone? Why don't you borrow someone else's phone to call it, and then ask whoever answers to kindly give back your phone. Happened to me with a walkie talkie when I was little ;)