Mostly for historical reasons, one E.212 MCC may correspond to multiple ISO country codes (e.g. Some operators also choose to use an MCC outside the geographic area that it was assigned to (e.g.Digicel uses the Jamaica MCC throughout the Caribbean).
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ITU-T publishes an official list of mobile network codes from time to time in the Operational Bulletin.
Unfortunately, the official list is often incomplete as national MNC Authorities do not forward changes to the ITU in a timely manner.
However, a TETRA network may be assigned an E.212 network code as well.