Administrators and 800#'s showing up on phone instead of the people who called me?

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Administrators and 800#'s showing up on phone instead of the people who called me?

Hello,

I have a ZTE N9137 , It has 2 administrators on it that I did not do. I tried removing the app in charge of the administrator, but it will not let me. Also, I'm getting different #'s showing up on my phone when people call.  Sometimes my kids# will show up as an 800 # instead of their  actual #? Help?

 

Thanks,

Sheri