The regulation of telephone numbers in Germany is the responsibility of the Federal Network Agency (German: Bundesnetzagentur, BNetzA) of the German government.
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Exceptions to the 11 digit rule are the four cities of Berlin, Frankfurt, Hamburg and Munich which are the only cities with two digit area codes and require only 10 digit numbers so as not to exceed the maximum length of 8 digits for a subscriber number.
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On 1 January 1998, the Federal Network Agency (named the Regulatory Authority for Telecommunications and Postal Services at the time) became the numbering authority for phone numbers in Germany.
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Apps are available for smartphones that automate the query for whole address books or announce the network immediately before placing a call.
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