At in-store Wireless Center only. Bring your own GSM cell phone, activate it with T-Mobile, and get a $300 Costco shop card. Expires this Thursday, Sept. 23. Limit 2 per account. Via online redemption using the form(s) they provide; allow up to 14 weeks processing. All lines must be active and in good standing when rebate is processed.
I BYOD’d 2 phones, to net a $600 Costco rebate. (Only a little less than the Costco/TMo iPhone 13 promo for a $720 rebate, but my current phones are working fine, thank you.)
QA note: Deal is in store only Costco Locator