Google Chrome
You probably think that there’s no better browser for iPhone than Safari, and, for the most part, you’d be right. It’s faster, easier to use, and really secure. Plus, it integrates seamlessly with your Mac and iPad via iCloud.
But Google Chrome also offers most of those things on the iPhone app, plus another feature: you can lock it with Face ID.
It’s weird that Apple hasn’t added Face ID support on Safari, but until they do it, you can use Google Chrome to keep your search history safe from anyone else who may be using your iPhone.