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Homologated for country X means adapted for the technical requirements of that country's phone system; and/or, approved for use in country X by whoever runs country X's phone system. Phone systems do differ slightly in ways that affect modems and non-homologated modems intended for the US market sometimes work in other countries, but not always reliably. In principle one can get in trouble for using a non-approved modem in some countries, but it doesn't happen much in practice. --Paul (former employee of a modem company)