There are dozens of other VoIP service providers that you can use with any current OBiTALK or Poly ATA or IP phone. It's not a paperweight. In fact, you should pat yourself on the back for getting a top-of-the-line, ~$200 phone for fifty bucks.
Google Voice is a special case. Consumer Google Voice and Workspace Google Voice use entirely different provisioning and authentication systems. There are no new products being manufactured that support consumer GV. The last such product was the 2182. The first, and only, so far, products to support Workspace Google Voice are the Poly VVX x50 series.