A basic overview of the VPN I use

Linux on a free/low cost VPS

Helper script install OpenVPN and generate client config file

Transfer client config file to mobile device

Install OpenVPN client on Mobile Device and import the config

There are a few options for the Linux server. Free tier cloud providers

AWS

Google

Azure

VPS with Free credits ($20-$100) for new accounts I've gotten discount codes from podcasts

Digital Ocean

Linode

VPS requirements for running a OpenVPN server are pretty are basic

Internet accessible IP address

Average Network speed

root shell access

The openvpn installer is on GitHub. https://github.com/angristan/openvpn-install

On the server as root, run

git clone https://github.com/angristan/openvpn-install.git

/openvpn-install/openvpn-install.sh