Instead of having your new T-Mobile handset shipped to your address, starting on the aforementioned date, you'll be able to pick up the phone you ordered online from your local T-Mobile store. Starting on November 10th, a deferred trade-in, which is an order that includes a trade typically mailed to the carrier after the customer receives his new phone, will be satisfied by returning the device to a local T-Mobile store instead of shipping it through the mail.

Leaked slide reveals that T-Mobile will allow Cross-Channel Returns starting November 10th
The competition already allows cross-channel returns so once November 10th arrives, T-Mobile will have caught up with the competition. One of the slides follows a customer's journey after he places a deferred trade-in order online through the website or in person at the store. The customer can decide to have his trade shipped to T-Mobile, or brought into a retail store.

The journey of a T-Mobile customer who has a deferred trade-in order.
If the customer does decide to bring the trade into his local T-Mobile store, an evaluation of the phone is performed. If the phone's condition is not as promised, the customer will have to accept and sign a new offer before the deal is considered to be complete. The customer then "leaves the store receiving a friendly farewell and any additional self-help options." The customer's account on TMO.com and the TMO app will show that the deal has been completed.
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