If you want to use VPN, buy one service to use as free VPN account does not provide good privacy for you.

Some recommended best VPN services.
Recommended VPN Service Providers (privacyguides.org).
Best Privacy VPNs (privacytools.io).

You can use VPN for multiple tasks online but if it is only for surfing the Internet for information and exploration, I simply use Tor.
Download Tor browser https://www.torproject.org/download/
It is avaialble on mobile https://www.torproject.org/download/#android
If you want complete privacy for your mobile, use Orbot https://orbot.app/en/download/