Thanks for starting this thread.
Sorry if I've overlooked this, but who/what will have access to this data?
Only members of the mobile team? Local project CheckUsers? Wikimedia
Foundation-approved researchers? Wikimedia shell users? AbuseFilter
filters?
And this may be a silly question, but is there a reasonable means of
approximating how identifying these two data points alone are? That is,
Using a mobile country code and exit IP address, is it possible to
identify a particular editor or reader? Or perhaps rephrased, is this data
considered anonymized?