I just got a call and didn't answer. Then 2 min later, a knock at the door. The Amazon Prime delivery man left a package of earbuds I had ordered on my front porch. He then called back to get the code to get out of my complex.
This is all both interesting and disturbing. I am replying to the first post in this thread in case my comment is helpful to others. There are seven screens of responses, and I read about half of them. It is clear that this number does indeed represent a delivery (or delivery attempt) from Amazon. I also received a delivery from Amazon (not specifically Prime or Prime Now as some posters mentioned) through their corporate delivery service AMZL within minutes of this call. I have had dozens of deliveries from Amazon via UPS or USPS, and now Amazon is using their own delivery service AMZL.
This is the first and only time I have received a phone call in connection to an Amazon delivery. I never answer unrecognized numbers, and this one displayed "Unknown Name". The package was left at my front door, and my doorbell did not ring. (However the text I received from Amazon said the package was left at my back door.) The disturbing part is that dozens of individual delivery drivers in dozens of states all make calls through this same phone number. How is that possible? These drivers (independent contractors?) obviously have some (spoofing?) facility provided by Amazon. I agree with many posters that since Amazon is providing the phone number, they could also provide a caller ID, and they should do so.
I will continue to ignore unrecognized/unidentified numbers, and I am disturbed to see that Amazon apparently uses what amounts to a number-spoofing technique, especially without identifying their company in the caller ID. I will continue to rely upon, and appreciate, the text notification that Amazon sends when a delivery is made. The phone calls, in their present form, and less than useless.