I recommend using Premiumize. They have an OpenVPN client, unblocker, downloader, etc. I am using it, and everything works perfectly. Never had any issue with their service or the VPN service.
You can give it a try for a month or 7 days using the following link: https://www.premiumize.me/
After the account is created, activate the trial with your phone number and then use the available options and guide to install and activate the VPN.