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In the case of the Kindles, the modem-on-a-card looks just like another USB device (which it is).
The mini-pcie interface is not used.
Just google qualcomm (they make the only modem chips worth having) to find any model modem command manual.
By International agreement, 99% of the commands are "standardized" so that any command manual will do.
The other 1% is "vendor reserved" which does not require disclosure.
Even so, they may want you to register and ask you for an NDA before you can down load the manual.
I was able to locate manuals that could be posted here, back in 2012.
Just search the attachments I made to posts that year.
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