Does it make sense to use VPN on iPhone for security?

I've heard different opinions about how VPN helps protect data, but in practice I don't know how effective it really is. Is it worth spending time and money on VPN apps for iPhone? If anyone already uses one, tell me which apps you would recommend.

There are some good free apps that can be your first line of defense and useful security apps for iphone that provide data encryption and protection against phishing. Even among free iphone apps, there are decent options for improving your security.