get $50 Costco cash card when activate a T-Mobile line and bring your own device, Warehouse only deal.
http://membershipwirel
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.