T-Mobile made announced that they will offer the iPhone 5c with no down payment and $99 down payment for the iPhone 5s. 24 monthly payment of $22 per month for a total device which cost of $528 if you want 16GB iPhone 5c. If you want 16GB iPhone 5s, it will require 24 monthly payments of $22.91 for a total device which costs $648.84.
T-Mobile will begin offering pre-orders for the iPhone 5c on Friday, September 13 at 12:01 AM PT and unfortunately, iPhone 5S will not be available for pre-order and can be purchased via T-Mobile on September 20. Be sure to check out Guide: How to pre-order the iPhone before it gets sold out (video) anytime.