

Uninstall that app and then restart your device. Secondly, find the affected app that is using a lot of data even in the background. If the antivirus app finds any malware, remove it. How can you remove the keyloggers then? This is simple, use an antivirus app and scan for the malware. If anything like this is happening, it is a sign that the keyloggers conquer your device. You also need to look for suspicious apps. For example, any script can cause your device to reboot often or any numbers tend to appear on the screen.

The second thing is that you should check for the unfamiliar and suspicious things happening on your device.

If any, then it could become a lot easier to remove the keyloggers. You should identify it by yourself whether or not you have any suspect from both of these. One is if anyone used your device and then inserted the bad script inside it, another one is that the apps you installed from the third-party sources included the malware along with the keyloggers. The first step for you is to know how keyloggers enter smartphones.
