Can I get T-Mobile ONE for $58/month with bill credit?

magenta6677819

    I want to jump on the Oneplus 6T deal with the $300 bill credit with a trade in. I plan to sign up for T-Mobile One, which is $70/month. After doing the trade in and getting the bill credit, my bill will increase to $82/month. After one bill cycle, I want to pay off for the phone early. Since the phone will be paid off, it will bring my bill back to $70/month. But what happens to my bill credit? Will it bring my bill further down to $58/month or do I lose bill credits by paying for the phone early?

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