Hi. I agree with you. These are my thoughts, you are right that perhaps many users can simply insert a 4G USB modem into a Librem Mini USB and get the same result, and perhaps it is even more convenient, since it is possible to physically remove the modem. As for testing, I saw such modems for sale at the official FSF seller (photo below), and you can also read Pine64 tests here NuttX RTOS for PinePhone: 4G LTE Modem
Useful links:
https://wiki.pine64.org/index.php?title=PinePhone_Carrier_Support
