How do I stop Safari from redirecting to Yahoo on iPhone 16?

Force-quit the app.

Quit and reopen an app on iPhone - Apple Support

Clear saved website data. Settings > Apps > Safari > Advanced > Website Data

Any Safari extensions loaded? if so, disable or remove those.

And as an aside, iPad cannot be paired with iPhone, though both can share the same Apple Account.

"iphone 16 - get rid of yahoo on safari ?: iPhone 16 all of a sudden safari goes to yahoo. I have checked settings and safari is default with google as engine. It won’t change back. My iPad is paired with the phone and iPad is fine, matching settings. I can’t access all my favorites on safari now that yahoo took over. Any advice to get rid of yahoo? Thanks."

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Browser Always Going to Yahoo!:

Indeed a bit odd. But, what are you opening here? Downloading iOS updates, Safari is always going to be Web browser that opens, default or not.

Clear the Caches:

Clear the storage named "System Data" (formerly called "Other"). It basically contains unnecessary files such as caches that are used for system ease of use, app remembrance - all of which gather over time. And the iPhone just might have a few of these settings that need not be when they are. Here is how to rid of these: How to Clear "System Data" in your iPhone's Storage: - User Tips. Caches would be being used for remembrance of application use.

You are welcome. Any success in fixing this? If so, please provide the fix, so others with this issue can have the solution too.