Interesting acquisition announced today....Blackberry to acquire Good Technologies. For those of you who don't know or are familiar with Good, it's basically a BYOD platform for enterprises. (Email, intranet, etc.) Not necessarily directly Sprint related, but many people use both.
I've seen some threads recently about the differences between SIM/UICCs and though posting a compatibility matrix would help people.
This is pretty straightforward. The matrix has every Sprint LTE device, and what UICC card is meant for that device. Mix and matching UICC card types probably will not work, but swapping around UICC cards for devices that use the same type of card should work properly.
Keep in mind, you cannot simply move your UICC card to another phone to use it. Sprint's device authentication system still requires the correct UICC and MEID to be on the account to authenticate properly and work.
The more sub 6GHz spectrum the other carriers pick up, the less advantage Sprint has. That advantage holds a bit tighter though for anything above 2.5GHz for realistic urban full on coverage.
However, it's a long ways to get there. CBRS is 150MHz right now, that will get split up once it goes up for auction. And it's a full 1GHz spread from 2.5GHz.
Then C-Band that is being looked into like 6GHz, you are looking at similar limitations that are on existing 5GHz. Unlicensed, low power output of 1w or 250mW. With current considerations there will be at least 850MHz for 1w output, but that is still just 1w.