Keeping your PSN account safe is critical for stopping malicious activity. But how can you check and find out if someone has been using it?

Steps to Check if your PSN account is in use Using the PSN App
As long as your PSN account is in use, your PlayStation app will show that you are online. To check it out for yourself, download the PlayStation app on your iOS or Android device. Next, log in with your PSN account details.
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Then just check if there is a green dot next to your username on the home screen or account information screen. Note that this option can be disabled from the console settings, so it may not be completely accurate.
Alternative Ways to Check if your PSN account is in use
If you suspect that someone is using your PSN account, but you cannot access your PSN mobile application, you can ask your friends for help. Your PSN friends can also view your docking station through the PSN application, website or console.

Alternatively, you can log in to your PSN account on the network and check for unknown devices connected to your account. To do this, go to the PSN website and go to Account > Device Management. You will be able to see the full list of consoles that are linked to your account.
Protect Your PSN Account
For many gamers, a PSN account is more than just a way to play our favorite games. It is also a catalog of the worlds we have explored and the experiences we have shared. For this reason, it is important that no one else manipulates it.
When it comes to protecting your PSN account security, nothing is overly vigilant. If you suspect that your account has been compromised, you can take various measures to regain control.