The first two or three B can designate the area (old area code) for geographic numbers, or the operator to whom the number resource belongs. There are also "short numbers" for emergencies (such as 112), that are written 1C or 1CC; and short numbers for special services, written 10 CC, 11C CCC, or 36 CC. 00 is the international access code. International format is +33 A BB BB BB BB where the leading trunk prefix 0 disappears (it must not be dialed from abroad). This format can be directly used in mobile phones. German telephone numbers have no fixed length for area code and subscriber number (an open numbering plan). There are many ways to format a telephone number in Germany. The most prominent is DIN 5008 but the international format E.123 and Microsoft's canonical address format are also very common. Trunk access code is 0 and international call prefix code is 00. Numbers are often written in blocks of two. Example: +49 (A AA) B BB BB (Note the blocks go from right to left)  The very old format and E.123 local form are often used by older people but also for technical reasons. Greek telephone numbers are ten digits long, and usually written "AAB BBBBBBB" or "AAAB BBBBBB" where AAB or AAAB is the 2- or 3-digit national area code plus the first digit of the subscriber number, and BBBBBBB or BBBBBB are the remaining digits of the subscriber number. The entire number must always be dialed, even if calling within the same local area; therefore, the national destination code is not separated from the subscriber number. According to international convention, numbers are sometimes written "+30 AAB BBBBBBB" or "+30 AAAB BBBBBB" to include the country calling code. In Hungary the standard lengths for area codes is two, except for Budapest (the capital), which has the area code 1. Subscribers' numbers are six digits long in general. Numbers in Budapest and cell phone numbers are seven digits long. Phone numbers in Iceland are seven digits long and generally written in the form "XXX XXXX" or "XXX-XXXX". Phone numbers in Ireland are part of an open numbering plan with varying number lengths. The area code system similar to some other northern European countries. Unlike the UK, Irish fixed line numbering is divided into a number of regions which are (except Dublin) further subdivided in a hierarchical structure, with the largest town often (but not always) taking 0A1.