https://venturebeat.com/2019/05/16/s...nd-htc-5g-hub/
Article above has some info on this "Premium" Plan.
I see Sprint is up to its old tricks. I bought the HTC EVO 4G in 2010 which claimed to be the first "4G" phone (Wimax not LTE) and they charged us $10/month for this "Premium" service. I didn't get 4G speeds until 2 years later when my 2 year contract was over lol. They finally added the service in my city. However, Wimax was being phased out and LTE took over.
The shame is you may not get full 5G for a couple of years until it is fully implemented. (Sorry for the rant, could not resist)