They poached it from the lower 5MHz of Sprint's PCS B-block. I'm assuming the plan is to eventually expand PCS to 20MHz, leaving two 5MHz blocks (one in B-block and one in G-block) for legacy HSPA and Sprint LTE.
Do we know where this additional 5Mhz of B2 is coming from? Did they get rid of the last of 1900mhz HSPA? Or take spectrum from Sprint? If they are using original T-Mobile spectrum I think that just leaves 5 mhz AWS for HSPA Sent from my SM-G988U1 using Tapatalk