You can't know for sure if someone is looking at you through your phone. There's no way to detect if someone is using a camera to spy on you remotely.
However, there are some things to consider:
- Phone security: Ensure your phone is secure by using strong passwords, enabling two-factor authentication, and keeping your operating system and apps updated.
- App permissions: Be cautious about the permissions you grant to apps, especially those that request access to your camera or microphone.
- Physical security: Be mindful of your surroundings and avoid using your phone in public places where you might be vulnerable to unwanted attention.
It's important to remember that while it's impossible to know for sure if someone is watching you through your phone, taking these precautions can help minimize the risk.