If your iPhone compatible with iOS 14 then you can set Opera Touch as your default browser over Safari. You just need to install the latest version of Opera Touch on your iOS 14 enabled iPhone from App Store. When you open the app it will take you to the screen where you can be set Opera Touch as your default browser.
Or, you can go to the iPhone settings app, then tap on the Opera Touch, now tap on the Default Browser App, and select Opera Touch, now you can use Opera Touch as your default browser on iPhone.
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