BlackBerry Q10: found AT&T data in my BB Q10, which i originally from the swiss carrier swisscom

Hello,

maybe, someone can help me out.

In a BlackBerry Q10, i activated the engeneering screen "escreen".

I was searching for settings...

Under:  "OS Engeneering Screen" --> "PIM",

I found the entry:  "AT&T Adress Book".

There are different Test Environment's, which i could change....

My question:

WHY do i have this in a smartphone , which i originally bought from the carrier swisscom in switzerland?

- SwissCom can't or don't want to help / to tell me something about that....

Could my BB have a different behavior, because of these settings / entry's ?

I don't know about any possible influence, because of these entry's / settings....

Kind Regrads