Well, I thought to use my borescope to check out the TCU unit in my late 2017 FFE.
Its Ford part GM5T-14G087-AG
On the outside were stickers with this part number , the IMEI (01450900.....), and the ICCID (89011702272......)
Doing a search for that part number yielded crappy results, as it seems that this part number is invalid at the ford oem parts websites.
Anyway, I found one up for auction here:
https://ahparts.com/buy-used/2015-ford- ... g/334197-1
Which is auctioning off a part for a 2015 C-Max.
You can see from the photos what it looks like, and there is a photo of the underside.
Turns out this module is made by Clarion. Its a model JE-5035, which is in the JE-5030 series.
An FCC report for the JE-5030 series in here:
They have internal and external photos, and a user manual that describes a software tool for testing the modem.
Internal photos are not showing a sim card slot, so swapping sim cards is out.
It uses a Telit HE920-NA, which is a 3G modem, BGA soldered to the main board. So replacing that module is a PITA.
I was hoping that by finding the part at an OEM parts website, I could see what is installed in a 2018, that just might be 4G LTE.