Off-Topic: I remember back in 2011, when I used to be with T-mobile. My G1 had battery issues, so what happened was that I've called T-mobile to replace my G1. They didn't have any in stock because it has been blacklisted back in 2010. So I had to settle for a much middle-range smartphone known as the T-mobile comet. The thing is they made me pay $40 for the phone with includes the insurance from my contract. So they will charge you if you're going replace the phone that's middle range and higher.
On-Topic: Yes, if they phone gets blacklisted then the carriers won't support it anymore.