Cinterion PLS63 not showing up as wwan0

[Brendan Simon]

IND.T Classification: External

I am using a Debian 10 Buster Linux system with ModemManager 1.10 (yes I know it's old, and we have tried Debian 12 Bookwork with MM 1.20) and cannot get a Cinterion PLS63 device to connecto the internet.  MM seems happy enough with it.  It is detected and I can show status information with mmcli command.

I have successfully connected over many years with this setup using a Quectel EC21 modem, but cannot connect with this new Cinterion PLS63 modem.

One difference is that the device seems to show up as a network interface  enxNNNNNN and not wwan0 , which is what the EC21 shows up as.
Is this expected?
Is this the issue?  If so, how can I get it to show up as a wwan0 device?

Some posts mention udev rules and port type hints.  Is this what I should be looking at and are there any example or suggested settings for this modem?

I tried using NetworkManger to setup a connection using the enx interface, but the nmtui utility did not recognise it.

Thanks,
Brendan.
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