Supported Carrier and Modem Bands
In the USA, T-Mobile is reportedly the one physical carrier to use, several MVNOs using the T-Mobile network under the hood are also reported to work. (I cannot verify this personally, because I do not live in the USA and have not been there for years.)

The blocking thing appears to be mostly a US issue, there are not many reports of such practices from other countries.

Messages In This Thread
Supported Carrier and Modem Bands - by NachoMomma - 01-30-2023, 03:18 PM
RE: Supported Carrier and Modem Bands - by wibble - 02-05-2023, 11:27 AM
RE: Supported Carrier and Modem Bands - by Kevin Kofler - 03-23-2024, 02:00 PM

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