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Also combinable with free line offer:
https://slickdeals.net/f/14604172-existing-t-mobile-customers-free-line-returns-11-25-plus-port-ins-get-100-rebate?v=1&page

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The One S was used years ago, but hasn't been on the account for a long time. I presume that will qualify as a BYOD phone?
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I also have the same question too
Rep asked me to log into terminal with my SSN and Last Name. Once my account was found, Rep asked for the IMEI of the phone I was going to use and area code I wanted for my new phone number.
About 10 mins later scanned my Costco card and gave me SIM card. Had me sign a few forms, gave me Costco $200 card submission paper work and off I went.
Got home and installed SIM card in the phone. A few mins later I got a welcome text from T-mobile. Checked my account online and FREE line was showing up on my account - 2020 Line on Us 3 (Additional Lines).
Already submitted paper work for $200 card.
Edit nevermind found it
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BTW when I checked my account I can already see the "$10 2020 Line on Us 3" as an account level promo, so no issue getting it for free even without mentioning it to the Costco rep.
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