I recently used an app that was for live wallpapers and then got a pop up that made a beeping sound (like the typical bomb from movies). I read some reviews of the app which describe the message as a scam, but for the future does apple even provide this type of message?
Here is a link to some sites I used for researchLink to img search of app cover of app I downloaded minutes before this one that may have also caused the incident (This one did lag which is a symptom listed for a virus, but also my device is sort of outdated and doesn't get updated any more so maybe the app is too updated