Like Opera's previous VPN integrations, the app uses the US-based SurfEasy VPN service acquired by Opera last March. Now, Opera has launched a new VPN app for iOS, and, again, it's free to use with unlimited data.
Last month, the company integrated a free and unlimited VPN (virtual private network) into the developer version of its web browser, and last week, it added built-in ad blocking to its desktop and mobile software. Opera is on a bit of a privacy tear at the moment.