MVNOs FTW. They know they're competing for price-conscious consumers so have to offer more value. The big 3 know most of their customers are going to go with one of the big boys, all of whom are expensive and not great.
MVNOs have slower data rates since they buy deprioritized traffic in bulk, don’t have the roaming agreements domestically and especially not internationally, and don’t offer unlimited high speed data.
Hm, not my experience. When traveling internationally there was an option I could have used, but I chose to use a local SIM card instead. The data speeds are just fine for me, and I haven't experienced any issues with roaming domestically.
But then I don't even care about 5g versus 4g/LTE for the most part, so perhaps I'm just not noticing limits that affect others.
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.
Based on the type of responses you are giving, I actually do believe you probably call your phone company's customer service regularly. So perhaps your criteria might be different. Have you heard of Consumer Cellular?