Parse list of ISPC from bulletins 1293 and 1295. Parse ICCID prefixes from bulletin 1283.
Wikipedia lists administrative companies with number of subscribers: https://en.wikipedia.org/wiki/List_of_mobile_network_operators And revenues: https://en.wikipedia.org/wiki/List_of_telephone_operating_companies Those 2 generally encompasses several national MNOs.
See if / how the list of national MNOs can be linked to operators listed in this project (also collected from Wikipedia).
All submarine cables and landing points: https://www.submarinecablemap.com/
Add the Google Android MNO db: https://android.googlesource.com/platform/packages/providers/TelephonyProvider/+/main/assets/latest_carrier_id/carrier_list.textpb https://android.googlesource.com/platform/packages/apps/CarrierConfig/+/refs/heads/main/assets/
Link URLs from database in https://gitea.osmocom.org/laforge/pub.3gpp-network.org/ to MNCs.