Didn't answer. Caller left no message. I thought it was a spoofed number and wanted to verify. Used *67 to call the number and a recorded message said United Healthcare and all representatives were busy but to hold. Asked if I would take a short survey while waiting. I hung up. Why would a legitimate business not leave a message. Hang up calls are just as annoying as spam calls. If you have United Healthcare for your insurance carrier you can call on a 800 number directly.