pretty much same as $ 100 off iphones, hope it helps someone.

Starting at 2:01 AM PST on Cyber Monday, T-Mobile is bringing back one of its most popular offers of the year. Buy a new iPhone online at T-Mobile.com and the Un-carrier will give you a free memory upgrade. The following memory upgrades are available for iPhone 6s and iPhone 6s Plus on Cyber Monday only:

• Buy iPhone 6s or iPhone 6s Plus 16GB and well upgrade you to the same model with 64GB
• Buy iPhone 6s or iPhone 6s Plus 64GB and well upgrade you to the same model with 128GB
  

Additional memory means more space for the epic photos and videos shot on your iPhone. It means enjoying more music and more of the 1.5 million amazing apps available on the App Store while still having plenty of room to grow your content libraries as your storage needs grow over time.

These offers are only available online and inventory is limited. Simply go towww.t-mobile.com/holiday.
=12pxQualifying service required. iPhone offer ends 11:59 pm PST 12/1/14 or while promotional quantities last. Web only. For HD voice, both parties must be on capable smartphones on T-Mobiles HD voice-enabled network. See T-Mobile.com for coverage and offer details.