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Your phone can’t be hacked, and if it could VPN wouldn’t protect you. And it won’t protect you from identity theft either. Everything in and out of your phone is end-to-end encrypted already. As you have a middleman in the form of the VPN provider you are counting on that middleman not to steal your identity and not to be hacked themselves. And many of them do sell your activity commercially, so using VPN can actually be less secure than not using it.

Something to think about→Don't use VPN - GITHUB

There are two legitimate purposes for using VPN:

• To allow access to a private network such as a school or business when you are not on site. 
• To allow access outside of a country with a repressive government that has restricted Internet access. (This has suddenly become more important)

Any other use is risky, and can lead to problems like the one discussed in this thread. VPN disguises your location by making you appear to be somewhere else in the world. But you usually can’t control that “somewhere else”, and if it is in a location that an app isn’t approved for the app won’t work. Plus the fact that the provider of the VPN knows everything about you and your location, as well as what sites you access through the VPN. So you are totally dependent on the VPN provider’s honesty. As a start, if the VPN is free, DON’T USE IT. The provider has to make money somehow, and if you aren’t paying them then they are selling your private data to make money. But even those that charge can’t necessarily be trusted. For example, a few years ago Avast was caught selling user browsing data. They claim they have stopped doing so. 

You don’t really need VPN when using public Wi-Fi, because all communications between your device and the servers it accesses are end-to-end encrypted.

If you want VPN for privacy about the sites you visit, that’s not a good choice as discussed; instead you should download and use the TOR browser.

With iOS 15.2 for iOS/iPadOS and MacOS Monterey 12.2 and later Apple now has iCloud+ Private Relay, which is like a super VPN, except that it doesn't spy on you.

You can reinstall your ad blocker, and if it blocks the ad blocker should have a “white list” of sites that won’t be blocked.

May I ask personally, you seem like an intelligent user, I’ve been told by most people that provided you surf on safe websites ie. non-pornographic, no bit torrent, just regular occasional image searches and questions typed into the browser that you’d like answered, that you don’t really need an ad blocker. Yet there are thousands of sales of Adblock applications in the apple App Store. I’m just curious if you were me and surfed with safari on iPad, iPhone, and Mac, always update the software, would you see a need to purchase an adblocker? Are there any sings or symptoms a phone, tablet or computer browser can display that lead you to believe you should install one? Sorry the question is so complex, you seem knowledgeable and the apple team has told me time and time again that safari needs no adblocker.

You use an ad blocker if you don’t want to see ads cluttering up pages. There’s a site I visit several times a day that has very useful content, but it is so full of ads that you can’t find the useful content without an ad blocker. It makes separating the wheat from the chaff easier.

If you enable the optional protection features such as iCloud+ Private Relay, disable tracking in Privacy settings, Apple Advertising, Safari settings/ Privacy & Security, it makes it harder to be tracked. But that has nothing to do with ad blocking; it’s a convenience feature more than a privacy feature.

Don’t just turn off VPN; delete the VPN profile and app.

Do you have an ad blocker installed? Are you using a VPN connection?