Have lost your friend or anyone else address?? well it is not your fault, I mean now you don't have to worried about it anymore. I've just found some internet software called "Phone detective" that can solve your problem.
what is phone detective? well, many people have used this tool because its worth. Imagine that you can find a person just by one click.. pretty cool huh? like a search engine, phone detective will find the details of people who searched by you. Including phone number, email address, carrier and other details.
sometimes it just get an email or phone number, but as long as the information of the people who want you search are available in some institute, then it could get the complete information about that people. Unfortunately, this tool only available in USA. but if you're live in there, I think this stuff is gonna worth for you if you want to search people information.