On Fri, 17 Feb 2017 03:37:57 +0000 (UTC), Stijn De Jong
wrote:

Over time, I should be able to figure out what the unique cellid of the
microtowers is (which may be a function of their MAC address or serial
numbers for all I know).

For CDMA femtocell, the unique ID is a conglomeration of:
MCC (Mobile Country Code)
SID (System ID)
NID (Network ID)
BID (Base Station ID)

For GSM femtocell, it's:
MCC (Mobile Country Code)
MNC (Mobile Network Code)
LAC (Location Area Code)
CID (Cell ID)

Stolen from:
http://people.csail.mit.edu/bkph/other/Cellular/osm_blog
Read the footnotes, which have some Android bugs listed.

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Jeff Liebermann
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