https://www.amazon.com/dp/B074TTVQYP

It has a standard RJ11 jack and plugs into something that provides POTS-style service.

https://www.amazon.com/dp/B074TTVQYP/

^ link to Amazon's page since the bloomberg article is short on details.

" Connect your home phone to your compatible Echo device to call any phone number, using just your voice Echo Connect uses your existing home phone service to make and receive calls, including 911 and international numbers (carrier charges may apply) "

so, this is basically just a speakerphone with Alexa that rides on your existing phone line (for the calls part) and wifi (for the alexa part). It's not a stand-alone gadget that provides "free" home phone service.