Starting today, Microsoft begins selling 64GB and 128GB Surface 3s on AT&T and T-Mobile (through the Microsoft store). In addition, Microsoft’s Atom-powered tablet/computer hybrid will be available in AT&T stores. T-Mobile will begin selling the tablet on July 31. For LTE, you’ll be paying a cool $100 extra.
https://gizmodo.com/microsoft-surface-3-review-the-tablet-i-want-at-the-pr-1696598172