Do all of the above. Also for future reference, there are programs like Avast Antivirus that allow you to GPS track your phone's location, as well as lock it remotely, access the camera remotely etc. There are TONS of anti-theft software on the Google Play Store which may help in a situation exactly like this one. As for recovering your phone, a friend of mine tracked his stolen phone to someone's house. He knocked on the door and requested it back (didn't work). After that he contacted the police and filed a report. Since the Police could not enter the house without a warrant, no charges were pressed and the thief got away without so much as a slap on the wrist.