[kop316]

This was a discussion with the Librem 5. I know that T-mobile USA does not whitelist phones (My Librem 5 makes calls, sends/recieves SMS, and gets LTE data on T-mobile). Calls/SMS don't work on LTE though (I think due to proprietary software, that is true at least on Android). The Pinephone Braveheart Edition is compatible with most of the LTE/3G/2G bands for T-Mobile.

However, I think Verizon at the least used to do this, and may still do it. Sprint also has some extra proprietary things on Android and I don't know their functionality.