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To get the current country code (North America = 255), type:
        AT#H

Write down this country code, in case the new country code does not work
properly.

Follow these steps to change the line interface to match those
used/required for operation in various countries.  Type:
        ATS38.1=1
        AT#G123         where 123 is the country code desired.
        AT&W            to save these settings

Probably best to power-cycle the modem at this point.

Again, a ZyXEL modem operating in the country for which it was approved for
use, should leave its country code unchanged.  Changing the country code in
a ZyXEL (for use in that specific country) SHOULD theoretically improve its
operation.  There have been reports to the contrary.  If problems occur from 
using a new country code, reverting to the previous country code might be 
advised.