Thanks for the input. I can see the files, but I cannot modify or add to the filesystem.
These files are stored /vendor/firmwar_mnt/image/ but that file system is read only.
I think possibly the only way to change it is to reflash the modem image from Sony.
This seems possible. I can locate the modem_X-FLASH-ALL*.sin file in the sony flashing files I can convert that to an image, and that indeed has the information I want. I can add the additonal modem configs for Telstra, Vodafone and Optus.
But then I am stuck. There is no way that I can see to turn the modem image file back into the .sin file for flashing (signed by sony).
Is there a way to flash the .img file with fastboot? rather than having to turn the .img back to .sin?
Any input would be great.
In regards to the pinephone, I had a look, but feel the modem is probably to far away from the sony’s to be useful.
Thanks though.