Originally Posted by
joecool1029 What I don't understand and would love to know is if they're broadcasting on a sliver or they can use the same frequency concurrently. As I understood it they have some technology that LTE towers can switch to GSM as needed in the same channel. I'm aware GSM is usually broadcast in HSPA guards (5mhz channel can go down to 3.8mhz for HSPA and use the rest for GSM as needed)
I know this isn't the broad, policy-based answer you are looking for, but one possible, cumbersome and limited way to check would be by going into e-screens, under Serving Cell (LTE) and checking UL/DL bandwidth, and comparing it to TMO's band 2 holdings in your market. If you know they have a 20 MHz PCS license but LTE only shows 15 in use, you know 5 MHz is still dedicated to GSM.
I'll keep searching on reddit. Maybe one of the engineering employees has written something about this.