>>> I can confirm that LE866-SV1 uses Telit custom 3GPP2 PDU format: there
>>> should be a PDU example in the AT commands user guide (see +CMGS
>>> 3GPP2), while EU variants use 3GPP.
>> Thanks for the information. Then it is expected that the USA version (the
>> one I reported) does not work with ModemManager because it uses 3GPP2 PDU
>> format? Or is this format also supported in ModemManager?
> My understanding is that it is currently not supported in ModemManager.


The issue here is that the message isn't formatted as 3GPP2/CDMA
because the modem is actually an LTE modem (i.e. 3GPP). As soon as a
modem is 3GPP, we use the 3GPP format, see:

The question now would be, is this something that happens to all
US-version Telit modems? Isn't this actually a bit weird, given that
the LE866-SV1 is actually LTE-only (i.e. 3GPP-only, not 3GPP2)?

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