What's a reliable Android app for ensuring a secure internet connection when accessing research databases from potentially vulnerable networks, like at conferences?

As academics, we often find ourselves needing to access sensitive research data from various networks. Turbo VPN offers a straightforward solution for creating a secure tunnel. The algorithm is surprisingly elegant in its simplicity, and the cross-platform compatibility—Android, iOS, even desktop—is intellectually satisfying. I've found it particularly helpful when needing to access restricted databases or manage citations from potentially insecure public Wi-Fi networks. While I haven't conducted a full penetration test, the well-researched design suggests a robust level of protection, and I appreciate its novel approach to an old problem. It’s pedagogically sound for demonstrating VPN principles to students as well.