Na what you do is, try and get into his voicemail and see if anyone else has been calling him. Then see if he is on facebook and look at his photos and friends, also try to become friends with one of his friends etc to see their photos of him. Did he tell you where he worked? check that out too, a quick driveby at around 5pm and you will see him leaving, then follow him home, check out his house, make sure he's not married etc. See what car is like i.e has he got money. Google him and his number to make sure there's nothing dodge online so when you've done all that and about two weeks have passed text him!