I use T-Mobile. For one season, I took the SIM card from my phone and put it in the Oudie N. For the next season, I used my phone as a hot spot. I experienced no difference in Oudie N performance between the two. To my surprise, both connected to cell towers while I was flying out of Moriarty. We have some areas with sparse coverage, away from the two interstates crossing NM. I had continuous coverage up to 18kft, and in any direction from Moriarty. So I basically pay my monthly $25 service fee. I haven't run into a throttling issue.
As a side note, I do know other Oudie N users here found connection issues with other carriers (I don't know which ones), but there are solutions.