Why is T-Mobile Giving Up Spectrum in Hawaii? March 5, 2024 17:30
T-Mobile made commitments to the FCC in the Memorandum Opinion and Order in their application for their Auction 108 (2.5 GHz Band Licenses). T-Mobile committed to divest by sale or swap, 20 MHz of spectrum in the AWS-1, AWS3, PCS, or 2.5GHz bands. The spectrum sold will be no smaller than 10 MHz blocks of TDD spectrum or 5x5 MHz blocks of FDD (paired) spectrum. T-Mobile has twelve months to file the transfer applications.
The FCC specifically called out two CMA markets where T-Mobile will need to divest spectrum: CMA385 - Kauai and CMA386 - Maui. Although T-Mobile's held spectrum in Hawaii doesn't stand out compared to other markets in the US, the issue with the spectrum screen in Hawaii is that 3.45 GHz spectrum (100 MHz) and C-band spectrum (280 MHz) are not available. This reduces the available spectrum by almost 400 MHz, thus reducing the spectrum screen by potentially 126 MHz.
![](https://cdn.shopify.com/s/files/1/0242/3115/files/MAP_Lower_Mid_Band_TMO_1024x1024.jpg?v=1710199512)
In the above map, the CMA markets in Hawaii are indicated. To see how each carriers spectrum totals up in each of these markets we will utilize our Web Spectrum Viewer - Spectrum Depth Module. First we have exported the county spectrum totals by band classification. Kalawao and Maui county make up CMA 386 and Kauai county makes up CMA385. The bottom 3 counties in the chart below represent the counties where T-Mobile needs to divest 20 MHz of spectrum.
Reviewing the data, it is clear that T-Mobile's lower mid-band spectrum and upper mid-band spectrum are the two areas where T-Mobile has a sizable advantage. I assume that EBS/BRS spectrum is off the table from T-Mobile's perspective and it would be difficult to sell that band due to T-Mobile's nationwide "exclusive" use.
Looking then at the lower mid-band spectrum, T-Mobile's held spectrum in both the AWS-1 and AWS-3 bands is pretty similar with Verizon and AT&T.
I will also note that if T-Mobile was to give up any of their AWS-1/AWS-3 spectrum holdings they would drop below their desired 20MHz channel in NR band 66.
There are two considerations for T-Mobile's PCS spectrum. First, T-Mobile controls two blocks of spectrum in all of the Hawaii counties, 15 MHz at the bottom of the band and 20 MHz at the top. I believe that T-Mobile's agreement with SpaceX utilizes the PCS G channels at the top of the PCS band, so I think the upper block will be retained. In a perfect world, T-Mobile would sell a 10x10 slice (A8-A11) of their lower block of spectrum to Verizon and swap their A6-A7 spectrum with Verizon for Verizon's F1-F2 spectrum. In this scenario, Verizon would increase their channel size in two of these counties from 10/10 to 20/20 and in Kauai they would have 25/25. T-Mobile would then have all of their spectrum together and could have a NR band 25 - 20MHz channel and a dedicated 5 MHz channel for SpaceX.
Add your thoughts to our LinkedIn post or the post on X.