If your device is hacked properly then it would be quite impossible to unpack your device. But if you find any threats in your device which affect the use of your device. Then you should go for the precautions and steps below -

1. Reset your phone
2. Use security apps on your phone
3. Remove unwanted applications
4. Use the security key to open your device every time, for advanced protection
5. Clear all the recent and unwanted apps

Read More - https://allsavvy.net/code-to-check-if-phone-is-hacked