Hi, I received a text today that I could order a physical or esim. I will follow up on how it does.
Question, are they an MVNO?
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No, I think they probably just have set up agreements for ad hoc roaming data with some provider(s), maybe a piggyback kind of deal. Iām not really sure how it works, though. Based on a comment I saw in their chatroom, the SIM can connect to different networks in different locations, for instance āOrange Franceā although itās inside the U.S. Mine showed AT&T when I tried it in my Librem 5. 
Keep in mind itās a data-only option, not a drop-in for the usual carrier capabilities. (EDIT: But combined with JMP Chat, it can be a complete replacement, of course.)
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Data as in I can make calls, using my jmpt.chat number, from my car without using a wifi hot spot, thereby making and receiving telephone calls anywhere with a cellular signal? Or something else?
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Thatās correct. The SIM card provides the mobile data (i.e. internet) connection, and the JMP chat account provides calling, SMS, and MMS ability.
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Iām getting "AT&T Plus, Roaming in a NOT Librem 5. I also want clarification whether in the US it always shows roaming and that the only cost is for data used and not additional roaming charges?
Yes, in the US (and everywhere else) it always show roaming - you will not receive any extra charges while it is roaming, since it always shows that. The only cost is for data used.
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Their early data SIMs (of which mine is one) came from Orange France (i.e. a travel SIM, technically), while later ones were from some other European provider, I think. You can see which provider yours connects to within the APN details. And yes, it will always be āroaming,ā which you need to enable in order to get connected, because this āforeignā SIM is roaming in the U.S. or Canada on whichever U.S or Canada networks are available. It will even switch automatically between the networks as needed.
The data charge is just a flat rate (currently US$6.99 per GB), and your usage is deducted from your stored prepaid balance, just like the monthly $4.99 charge for the JMP phone number, as well as any domestic calling over the included 120 minutes (less than 1 cent/min), and any calls to foreign numbers, which cost extra). You can set up auto-topup if you want, or not. No other associated charges for data roaming.
They can provide data SIMs or eSIMs for other countries/regions now, also. (Iāve used their Europe eSIM.) And they sell an eSIM adapter (writable SIM card), too, so you can buy eSIMs, write them to the card, and use them in any of your phones.
P.S. The data does not expire.
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