So, Are you having this big question in your mind..!
Is spoof calling illegal ?
Well, the answer is “No” as long as you just wish to have some fun without making any harassment. But if your intention is to do something criminal then then it will end up as illegal act. As far as you keep it with your friends and family and let them know about the prank calls its completely legal.
As far US government, the Federal Communications Commission (FCC) Caller ID Act of 2009, Caller ID spoofing in general, isn’t illegal in the US but malicious use of it for causing harm is a crime. The H.R. 251: Truth in Caller ID Act of 2007 (to amend the Communications Act of 1934) was passed the House on June 12, 2007. As of May 2008, it had not passed the Senate or been signed by the President. But Federal Communications Commission (FCC) Rules do apply and prohibit telemarketers from using using spoofed, misleading, or faked caller ID information. Businesses that violate FCC laws can be fined but police and other law enforcement personnel are exempt from FCC anti-spoofing regulations.So we can say both Yes and No to this question depending upon your intention. As long as you have no criminal intent its safe. Moreover most of the spoof calling websites which provides these services follow all these rules and regulations and are completely safe to use. To be on the safe side, it will be legal to make use these websites when trying out a spoof call.