Well if you increase Magenta to Magenta Max, your price should go up, not down. Although you can get more perks on Magenta Max.
Per current pricing on their website, the third line free applies to not just Magenta Max but Magenta and Essentials as well.
https://www.t-mobile.com/cfd/plans-and-pricing/
For example on Magenta, One line is $70, but two lines or three lines are a total of $120. The additional line should have all of the same features as the first two line do.
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