I do believe band 41 is the 2.5ghz spectrum that TMO is using for its 5G UC network. I've been a Sprint customer since 2010, and their 2.5ghz spectrum is more or less why TMO bought them. After adding even more spectrum in the FCC auction (spectrum which is going live in the next few months), the N41 band should provide even more speed and capacity when coupled with bands N25 and N71.