Making changes to old Friends and Fam 2 Lines on Us promo?

magenta5660364

    Hi all. I have the old Friends and Fam 2 Lines on us promo on my account, with both free lines on mobile internet plans (SC NAmerica MI 6GB). I'm wondering if it's possible to change one of the lines to a voice line without affecting the promo? My base plan is SC NA UTT+10GB each 2 Lines for $100/mo. Thanks.

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