They have ordered triband n71, n26 and n29 low frequency RRUs and dual band n70 and n66. Something tells me that they will deploy the lower band first and then deploy enough of the midband RRUs to meet the deployment requirements. Of course I expect them to deploy first in the urban areas then suburban. Overall I think they will live within their means as far as deployment, shielded by the roaming agreement with t-mobile.
For me the interesting event will happen in 3 years when T-Mobile's leases with other holders of 600Mhz spectrum expire. Will we see a bidding war between T-Mobile and Dish for those leases?
That's not 100% true. The X55 modem supports mmWave carrier aggregation of up to 8 carriers or 800MHz. In NYC T-Mobile aggregates two 50MHz n261 carriers.
It also supports aggregation of a select few sub-6GHz bands. However, the sub-6GHz aggregation won't be meaningful until the x60 launches which will likely have CA support for nearly every sub-6GHz band.
In May, Qualcomm and Fujitsu achieved a multi-gigabit connection by aggregating NSA 3.5GHz and 4.9GHz with a X55 modem in a smartphone.
If I had to guess, they'll deploy just enough to meet their federally mandated requirements (70% of the US population within ~3 years), based on where the concentration of their Boost Mobile customer usage is. They've got a sweetheart roaming/MVNO agreement with T-Mobile for seven years so there will be a ton of places it won't make sense to build out. They'll deploy with 600 MHz in those areas first, since that'll be the quickest way to satisfy the buildout requirements...plus 700 downlink. AWS deployments will probably start with the same cell sites, but i expect there'll be AWS-only sites in cities as that's one fewer set of radios to set up and I'm convinced Dish will build this network as cheaply as they possibly can.