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2. Telephone numbers in Argentina - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Argentina

   Telephone numbers in Argentina. In Argentina, area codes are two, three, or four digits long (after the initial zero). Local customer numbers are six to eight digits long. The total number of digits is ten, for example, phone number (11) 1234-5678 for Buenos Aires is made up of a 2-digit area code number and an 8-digit subscriber's number ...

3. Telephone numbers in Italy - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Italy

   Italian telephone numbers are defined by an open telephone numbering plan that assigns subscriber telephone numbers of six to eleven digits. In addition, other short codes are used for special services. The plan is organized by types of services, [1] indicated by the first digit. Geographic landline numbers start with the digit 0, while mobile telephone numbers start with 3. Four types of ...

4. Telephone numbers in Poland - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Poland

   The assignment of telephone numbers in Poland is controlled by the Office of Electronic Communications (Urząd Komunikacji Elektronicznej or UKE), the national regulatory authority.

5. Telephone numbers in Vietnam - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Vietnam

   Mobile telephone numbers. [1][2] In Vietnam, mobile phone numbers follow the format 09x-xxxxxxx or new prefixes: 03x, 05x, 07x, 08x. The first 0 is the trunk code. The next 2 digits (3x, 5x, 7x, 8x or 9y) specify the mobile phone operator. Some mobile phone operators have been given more than one operator code. In Circular No. 22/2014/TT-BTTTT ...

6. Mobile country code - Wikipedia

   en.wikipedia.org/wiki/Mobile_country_code

   Overview. The mobile country code consists of three decimal digits and the mobile network code consists of two or three decimal digits (for example: MNC of 001 is not the same as MNC of 01). The first digit of the mobile country code identifies the geographic region as follows (the digits 1 and 8 are not used): An MCC is used in combination ...

7. Transaction authentication number - Wikipedia

   en.wikipedia.org/wiki/Transaction_authentication...

   Transaction authentication number A transaction authentication number (TAN) is used by some online banking services as a form of single use one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication.