Online users are receiving technical support, Facebook, donation, and social security, and bank telephone scam calls from an 866 area code. Please see the comments below, if there are any. If you have calls from area code 866, please share your experiences with me by leaving a comment below. Area code 866 is a toll-free area code reserved for future use in the United States and Canada, but it seems as if it's currently in use or being spoofed.