What eggthumbs said was only in regards to matrix stuff, which joadri brought up in his purism description (quoting them).
We definitely won’t have problems with regular calls and SMS service
Though, the major problem might be lack of the LTE bands and even some frequencies. As of now, the 1 modem they already decided on , covers a half of what Att & vzw have. So, my hope lies in their additional slot, which they may fill or maybe we can add one ourselves. One that would be affordable and actually close that Gap.
Fingers crossed