Virus on iPhone?!

There is no app to identify one on your iPhone because there are currently no viruses in the wild that can run on your iPhone assuming it is not jailbroken. You can use your favorite search engine if you want to confirm what I just said. The problem with putting a virus on an iPhone is by definition a virus has to be able to replicate to other apps/areas on the device. Since iOS is sandboxed, and has no available user file management system, there is no way for that to happen.

You might want to try restoring your iPhone from your backup and see if that helps.

Are you sure? I think I have a virus too cuz I had to remove some apps after they "acted up" when I was scammed out of $150.00 for signing up for Roku!! I think there's something going on and even Apple has admitted their phones have been compromised!!

Why do you believe so?

There are no viruses that can run on your device.

Because I am very smart.

Apple never admitted anything like that.

I am moving on to help people that really need it.

On your phone go to Settings > Battery and check the battery health. If it is near 80% or below that is your problem and you need to get it replaced.

You are better off having an Apple Store or Apple Authorized Service Provider do so.