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Peru uses 2-digit area codes followed by 6-digit subscriber numbers outside of Lima. In Lima the area code is "1" and the subscriber number has seven digits, divided XXX XXXX. The "trunk 0" is often used, especially for numbers outside Lima. For example, a phone number in Arequipa might be written (054) XX-XXXX.
For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 394 259-2653 is invalid, because the NANP is not assigning area codes with 9 as the second digit.
For example, individual extensions at Universität des Saarlandes can be dialed directly from outside via their four-digit internal extension +49-681-302-xxxx, whereas the university's official main number is +49-681-302-0 (49 is the country code for Germany, 681 is the area code for Saarbrücken, 302 the prefix for the university).
Extension (telephone) In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom. Such extension phones allow making or receiving ...
When calling France from abroad, the leading zero should be omitted: for example, to call a number in Southwest France, one would dial +33 5 xx xx xx xx. French people usually state phone numbers as a sequence of five double-digit numbers, e.g., 0x xx xx xx xx (and not, for example, 0 xxx-xxx-xxx or 0xxx-xx-xxxx or 0xx-xxx-xxxx).
Telephone numbers in Hong Kong are mostly eight-digit. Fixed land line numbers start with 2 or 3, mobile (cellular) phone numbers with 5, 6, 7 or 9, pager numbers with 7 and forwarding service with 8 [citation needed]. Since the end of 1989, there have been no area codes within Hong Kong. The telephone number for emergency services – Police ...
00 800 – Freephone / toll free (from all Irish mobile and landlines. 8-digit numbers in the format 00 800 xxxx xxxx. Where high volume 'bursty traffic' is anticipated, such as on-air radio competition lines, the first two digits of the phone number are always 71. For example: 1800 71 x xxx or 0818 71 x xxx.
China's mobile telephone numbers were changed from ten digits to eleven digits, with 0 added after 13x, and thus the HLR code became four-digit long to expand the capacity of the seriously fully crowded numbering plan. In 2006, 15x numbers were introduced. In late 2008, 18x and 14x (for data plans or IoT) were introduced.