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The regulation of telephone numbers in Germany is the responsibility of the Federal Network Agency (''German:'' Bundesnetzagentur, BNetzA) of the German government. The agency has a mandate to telecommunications in Germany and other infrastructure systems. == Overview == Germany has an open telephone numbering plan. There used to be no fixed lengths for either area codes or subscriber telephone numbers, meaning that some subscriber numbers may be as short as two digits. As a result, dialing sequences are generally of a variable length, except for some non-geographic area codes for which subscriber numbers use a fixed-length format. It is not possible to determine unambiguously the end of a phone number from a prefix or the digits already dialed. This feature allows the extension of the length of phone numbers without revoking or changing existing numbers. Cell phone numbers in Germany are not given geographic area codes but non-geographic codes. Thus they can easily be told apart from other numbers. A new numbering plan was introduced on May 3, 2010. Since then new landline phone numbers have a standard length of 11 digits including the area code and omitting the trunk prefix 0. Area codes remain as they are and are still variable in length. 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.〔http://www.bundesnetzagentur.de/cln_1911/DE/Sachgebiete/Telekommunikation/Unternehmen_Institutionen/Nummerierung/Nummerierungskonzept/nummerierungskonzept_node.html〕 The German telephone network uses 5200 geographical area codes, the length of which varies from two to five digits (not including the trunk code 0), with five-digit area codes only being assigned in the New States (prefix 03). In general, geographic area codes start with digits 02 to 09, whereas other non-geographic area codes including those for cell phone usage are assigned to 01 and network services to 11. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Telephone numbers in Germany」の詳細全文を読む スポンサード リンク
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