Looking around online it's apparent that the 2G modems on our cars were replaced with 3G ones in the US. Some folks have tried swapping in similar TCMs with LTE but have been unable to get them to connect to MFM.
Based on a recent post in the MFM message board, it looks like it might be possible to move the SIM from an existing TCM to an LTE model from another vehicle (I think the 2018 C-Max was mentioned), and it may be able to connect to the MFM server that way. But that would require opening both modules and rely on a physical SIM which might actually be soldered on the board rather than removable.
Anyone looking at trying a swap like this before AT&T sunsets their 3G in Feb 2022? I managed some 2G devices during their last sunset and they didn't draw it out - within a couple days of the deadline it all went dark.