Calling out using 'device line' still shows the primary phones caller ID

deriktran

    Using iPhone 6, iOS 10.1.1, AT&T carrier with DIGITS app.

     

    Tried calling out using DIGITS app as 'Device line' - It's still showing my AT&T phone number as the caller ID.  Is that work as designed or should it be showing my 'device line' from T-mobile?

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