If you knew someone in high school, there is a fifty-fifty chance that you have lost touch with them. If that has happened, don't feel bad, as it happens to just about everyone. Though we lose touch due to fights at times, it is usually just a slow progression through life and it happens before you know anything is amiss. When it comes time to look them up again, you may find their number through a high school alumni association, but don't always count on it.

A high school that has a very organized and well funded alumni association is going to be the one that would be most likely to have a phone number that you can get. The problem is that most will not give out any personal information like a phone number or address without permission from that person. Some will give alumni associations that permission to do so, but that does not happen a lot. In many cases, they will take your information and then send it to the other person so they can contact you if they wish.

You may want to try a few other options if you can not get what you need through your high school alumni association. The Internet can be a great tool in that regard, and can give you what you need. Search the person by name in all of the places you can think of, and don't forget to include social and professional networks. Those can be great places to reach someone, even if you can't get a phone number that way.

Probably the best place to find this type of information on an old classmate is to find them on a site like Reunion.com or Classmates.com. These are made for connecting with old school friends, so they can be the most powerful tools you can use. If you can't find someone there, post a query about them on the message boards. Someone else may have a number or an email address that you can use to contact your buddy.

If you find what appears to be a phone number for your old friend through any of the above sources, but you want to be sure it is current, you can use a reverse phone lookup to see if it is indeed a match. This type of phone number search can get information on all types of numbers, even mobile ones that are very hard to find and identify.