In iPhone 12, there is a feature in the latest iOS software that is to use other apps as default for things like your internet browser or email app.
So, if you want to use Google Chrome as your default browser, download it from the App Store and then open your iPhone Settings app and find Chrome in the list at the bottom.
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Tap it and then choose ‘default browser’ from the next screen, and choose ‘Chrome’ on the following one. Now Chrome will be the default browser.
You can do the same with email apps, so if you want to use Spark or Gmail instead of Mail as your default, you go to Settings, find your third party email app, tap on it, then choose ‘default mail app’ on the next screen, and then choose Spark (or whatever email app you’re using).