Where to search cell phone numbers?

I had a very good school friend who shifted to another place after marriage. I tried a lot but couldn’t find any way to reach him.The only information I have about him is his name and age. At present I am using the At&T Service in Dallas (Texas). I wanted to know whether there is any service through which i can reach my best friend or can search cell phone numbers to find his number with his name which i believe could really take me much close to what I am really looking out for. Does anyone knows about any such service, I got to hear something of this sort among my colleagues. Every suggestion is welcome.