Free ad-supported service + free phone coming in 2020 or 2021 depending on where you live. The ad is via a banner located at the top of the screen. Device is from a 2nd tier manufacturer with a 6.3" display, 4gb RAM, 128gb internal storage, 16mp rear camera, and a 4800mAh battery that has a claimed $350 value. They also claim that after 2 years, the company will send you a new phone!
As of now, the only thing an interested user can do is sign up for updates. They are planning to do some sort of crowd funding. This is probably where you will be able to a phone outright without the ads and still get free phone service.