Caller didn't leave a message on my machine and the caller id said "Free Security" which probably means telemarketer/scammer. So I ran 3 reverse traces using 3 different types of traces and all were blocked for a person or business name and the only information was a general location of Atlanta, Georgia using a service provider of Neutral Tandem Inc.-GA. This is definitely a scammer, since there is no such thing as "Free Security", that is either spoofing numbers or using a voip system while phishing for personal information and running some scam ( i.e. Home Security, Alarm System offer etc. ). A legitimate business would never hide their identity and location from the public by blocking a trace. DON'T ANSWER AND DO NOT CALL BACK FOR ANY REASON. Block and report to the proper authorities. Phone companies should be held responsible for these types of calls since they are making money from them by providing the systems and services that these scammers use and possibly farming out numbers too.