I went into a local T-Mobile store tonight to inquire about maybe moving from the iPhone 6S to the Galaxy S7 using one of my 3 yearly upgrades. Anyway the girl at the store said they just got an email from corporate saying not to honor that anymore because people are getting too confused about it and go back to the traditional Jump program. Anyway we had a back and forth about whether they can do this even if you bought your original phone on the program because I was asking if I turned in my 6S now and got the S7 could I turn that in and get the iPhone 7 in September if I want. She said only if I paid off half the lease on the S7. So I guess I'll have to check and see if me signing up for the JOD program when I got the 6S in December is binding for any particular period of time.