There are quite a few investigator resources which can be used to find who called you. Since, such resources are in abundance that is why you would not have any difficulty in locating a precise resource. There are some volunteer investigators to find who called you. These are the resources where people share the information about their own phone numbers voluntarily. However, if the caller is a jail bird then it would never share its information on such resources that is why there is very low probability of knowing about a phone number by using these volunteered directories.

Most of the online investigator resources to find who called you would not give your authorization to access their database free of cost. If you desire to use any directory then you would have to pay the membership charges. The membership charges might be different for different resources. You can search on the Internet and find a resource according to your own convenience. You can select a resource whose price is according to your budget. If you desire to get a membership then you should have budget between twenty to fifty dollars. You would also require a credit card so that you could pay the payment when required.

Only a couple of decades ago there were only paper based investigator resources to find who called on the phone. At that time it was very hard to investigate about phone numbers. It was a tiresome and time consuming job. However the advent of the Internet and online databases has made it possible for people to get information about telephone numbers. Performing a research on the Internet is a very easy job, you would just have to insert the desired phone number on the website and would get the information immediately after providing this information. Phone number look up resources may also ask for your identification information and you would have to provide it if required.

You do not have to be investigator to find who called you. It is quite easy to perform an investigation on the Internet. Even if you are novice on the Internet then you can perform a perfect investigation. All you would require is to find a good resource; if you would make it in finding an appropriate resource then you would be able to obtain exact information about telephone numbers. It means that maximum effort is required in resource selection phase.