get $50 Costco cash card when activate a T-Mobile line and bring your own device, Warehouse only deal.
New post paid line of service required
Device payment activation required
Costco Cash Card via online redemption via mypromochoice.com
Offer valid 3/1 - 3/8/18
Thinking about activating my 3rd and 4th T-Mobile ONE line with this promo. Then buy 2 iphone 8 to get $700 back.
offer date extended to 3/15/18. Thanks QkTreasures for the info