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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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No must activate the new line at the Costco kiosk to qualify for the $200.
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1 - Go to Costco with an unlocked phone.
2 - Ask the rep to activate it.
3 - While at Costco call Tmobile and get the free line activated.
4 - Give the info about the free line you just got to the Costco rep.
5 Then you get the 200 from Costco - in a gift card - sent in a couple of weeks.
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