That’s how MVNOs work, they buy data in bulk at wholesale prices. But they
pay for lower QoS. There isn’t anything wrong with that. But they are getting jankier bandwidth.
T-Mobile comes with 5GB of high speed data per month to use for roaming in Canada and Mexico and lower speed data roaming almost anywhere else in the world.
https://en.wikipedia.org/wiki/QoS_Class_Identifier
T-Mobile comes with 5GB of high speed data per month to use for roaming in Canada and Mexico and lower speed data roaming almost anywhere else in the world.