Tmobile Line on Us Promo - Changing Plan From Simple Choice to Tmobile One


    Hi, I have 10 lines on my account under Simple Choice where the 10th line is a free line with the Tmobile Line On Us promo back in March 2017. I wanted to check if I switch my plan from Simple Choice to Tmobile One, will the Line on Us Promo carry over (ie the 10th line is still free) or will it void the promo and I will be charged for the 10th line?  Thanks.

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