noord vpn is a pretty shit vpn, id recommend something like mullvad, protonvpn, ivpn, etc.
however none of this matters for google voice. google voice calling isnt peer to peer and goes through google’s servers so your ip will not be exposed by calling, and even if it was thats extremely low stakes. id say its only worthwhile using a vpn if youre letting them onto a vm or visiting their sites, the actual calling side of things you should be fine.
i will note that whatsapp and telegram (by default) are p2p calling, and you may want a vpn to use if you call scammers on those, however you need to get a vpn that allows p2p traffic.