You'll need your MSL code or "Activation code" from Sprint, I got mine when I activated a different sim card on my Note. I received an email and it had it listed right there, so I didn't have to play around with Sprint to get it. To change it however you need to open up your dialer and enter ##data# or ##3282# then go to LTE and hit edit, put in your MSL code and go to LTE then change the nextLTE mode to whichever you want (default is 5), I have mine at 2 right now. 1 is the lowest that you can go, then once you're done hit ok then restart your phone.