The current broadest list of supported parameters are:
* phone (ATPH)
* iccid (ATS#)
* imei (ATIM)
* operator (ATMN)
* operating_apn (ATOA)
* apn (ATAN)
Not all of these config values are available on all XBee/XBee3 Cellular products (depends on which AT commands are supported).
This set of configuration is also documented in our typehints, which is integrated with the XBee MicroPython PyCharm plugin. https://github.com/digidotcom/xbee-micropython/blob/master/typehints/common/network.pyi#L43
If this list does not cover any particular parameters you wish to configure, you can always use xbee.atcmd() to perform the configuration using our AT commands.
In the meantime, I have put in a note internally that we should put this list into the Digi MicroPython guide.