I’m a security expert – red icon is eerie sign that your iPhone has secretly been hacked

SIX sinister signs can signal that your iPhone has been invaded by criminals – and one is a red icon.

Cyber-experts have revealed the "red flags" that all iPhone users should look out for.

A tech expert at cybersecurity service Clario what to look out for.

Clario noted that iPhones can get viruses "but it's highly unlikely".

"As long as you don’t jailbreak your iPhone and update the operating system regularly, the chances of contracting a virus are low.

"However, while the possibility of catching a virus is slim, your device is still vulnerable to other .

"Therefore, you should know the best ways to protect it and how to tell if your phone has a virus if your protection measures fail."

The six signs of an iPhone 'infection'

First of all, many of these signs could have another explanation besides hacking.

So while you should look out for the clues of a hack, don't immediately assume your device has been compromised if you notice one.

Instead, see one or more of these signs as a good reason to investigate your iPhone to find out what's going wrong.

The first sign is when you see the red "temperature" icon appear.

This is a full-screen pop-up that reads: "iPhone needs to cool down before you can use it."

You'll normally only see this on very hot days or if there's a problem with your battery.

"But, in rare cases, it could indeed be a sign of a virus," Clario explained.