T-Mobile One "kickback" vs. existing promotions?

rbob

    The fine print on the "kickback" deal says 'May not be combinable with bill credit device offers; enabling KickBack may cause you to lose these monthly device bill credits" There's a "Read More" button there, but it doesn't seem to have any elaboration on this.

     

    I currently get a $13.55 monthly bill credit because I signed up for T-Mobile One at the same time I got my Google Pixel. is this a "bill credit device offer?" Will I lose the $13.55/month credit if I activate the kickback?

     

    A more detailed explanation of exactly what "may cause you to lose ..." means would be nice.

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