Original: The single digit group identifiers are : 0 or 1 for English-speaking countries ; 2 for French-speaking countries ; 3 for German-speaking countries ; 4 for Japan ; 5 for Russian-speaking countries , and 7 for Mainland China ( excluding Hong Kong and Taiwan , which have 962 +988 and 957 +986 respectively ) .
Simplified: The group identifier code ( GIC ) number is 0 or 1 for English-speaking countries ; 2 for French-speaking countries ; 3 for German-speaking countries ; 4 for Japanese ; 5 for Russian , et cetera .