Why does my phone alway have apps i never seen open

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It's really not possible to tell if someone has been into your phone unless they have done something that you would notice the changes.

The only way the could get into your phone is if you have no password or fingerprint. Or you have a password that is simple and they figured it out.

If you are unsure change your password. Thanks.
 
It is as the above poster said. Don't leave the device lying around, have a strong password and discourage others from touching it.
 

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