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iOS does not allow you to change the default browser, which has been one of the reasons why third-party browsers are not widely used. But if you've jailbroken your iOS device, then it is possible to change the default browser.
An aptly named jailbreak tweak called Browser Changer allows you to change your iPhone's default browser from mobile Safari to a third-party browser.
All you have to do is follow these simple steps to change your iPhone's default browser using he jailbreak tweak: