Got a call from this number. The caller did not leave any message.

called at midnight 3-13, didn't hear a disconnect, but no one said anything.

Someone from this number called me at 2:47 PM EST on 3-24.  I was unavailable at the time of the call so I rang it back when I was able.  I received a message from an Indian speaking representative telling me the number was no longer being used and to call this number - 877-800-8018
When I call that number it gives this message "The number you have dialed cannot be reached from your calling area" then the line disconnects.

If you read my previous post you can use this as an update.  The same number called me back just a few minutes ago.  It is a outbound phone number from Dell Technical Support.  They are calling and giving updates to people about the ETA of replacement parts.

Someone with an Indian accent claiming to be from "United Healthcare" calling to verify demographic information about a medical provider.   Sounds like a scamming list-builder.  Since Googling the number doesn't lead me to any of United's pages, I am going to ignore it.  The calling number came into our system as "anonymous."  Unscrupulous companies do that when they want to bypass a company's ability to block future calls.