Rent a cheap VPS and install a VPN server with e.g. Wireguard yourself. This one line installer also exist for OpenVPN:
https://github.com/l-n-s/wireguard-install
Also don't forget firewall rules and automatic security updates in your VPS.
Of course, I meant to ask which one do you trust the most?
I'm also looking for a VPN to use with my iPhone.