For international toll freephone (UIFN) services, the International Telecommunication Union (ITU) has defined the service code +800. This country code is followed by an eight-digit call number, so that the entire UIFN number has 12 digits: +800 xx xx xx. The plus sign stands for the traffic separation digit and is 00 in Germany. In addition, there is a definition for a 12-digit call number extension.
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|Englisch:||universal international freephone number - UIFN|