Hello apar67,
Thank you for posting in the Apple Support Communities. From our understanding, there is an unrecognized app or website on your iPhone 7, and we'd like to assist.
First, this sounds like a website, and clearing your Safari web history was a great step. We also suggest clearing cache and cookies, and enabling Fraudulent Website Warning in Settings > Safari. Here's a visual guide:
Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch
On the other hand, if you've discovered that this is an app installed on your iPhone, we recommend searching for the app in Search, then deleting it by touching and holding the app, then tapping Remove app > Delete App. These support documents explain how:
Use Search on your iPhone, iPad, or iPod touch
Delete apps on your iPhone, iPad, and iPod touch
Additionally, consider if anyone else has access to your device or Apple ID who might have installed the app. If that doesn't seem to be the case, and if this doesn't appear related to a suspicious website as we've explained above, then you might consider resetting your Apple ID. If you do reset it, be sure to change your password everywhere you use it:
Change your Apple ID password
What to do after you change your Apple ID or password
We hope this information is useful. Kind regards.
