Caller didn't leave a message on my machine and the caller id said "Green Energy" which probably means telemarketer/scammer since every legitimate caller I know leaves a message. 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 Los Angeles, California using a mobile phone with 3 service providers of Sprint Nextel, Nextel Communications Inc. and Sprint Spectrum LP. This is definitely a scammer that is either spoofing numbers and/or using a Voip system while phishing for personal information and running some scam ( i.e. Solar Energy, Green Solutions, Lower Energy Bill 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.