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Land line phone numbers in Vietnam follow the format Area Code + Phone Number. The area codes depend on the province and/or city. To dial a number within the same province or city, only the phone number needs to be dialed. When dialing from a different province/city or from a mobile phone, follow the format 0 + Area Code + Phone Number.
Another approach to reducing SMS spam that is offered by some carriers involves creating an alias address rather than using the cell phone's number as a text message address. Only messages sent to the alias are delivered; messages sent to the phone's number are discarded. A New York Times article provided detailed information on this in 2008. [27]
Premium rate numbers start with 1900; premium rate SMS have 4 digits starting with 4,5,6,7,8 and the 2nd digit decides the price (except 1400 - 1409 with variable prices from 3000-18000 VND per sms, reserved for charity and 156, 5656, 1414 which are free).
A JavaScript function can check to see if a phone number is a valid format, i.e., is numeric, starts with a valid set of numbers ("0" for local, or an international dialing prefix followed by a valid country code and is not too short to be a phone number. At first a JavaScript function is used to clear out any spacer characters.
In the Philippines, the prefix for toll-free numbers is "1800" followed by either one, two, or four digits (examples include 8, 10, and 1888), and then by either a four- or seven-digit phone number. However, there are restrictions. Toll-free numbers are limited to the telephone network where the toll-free number is being handled.
This list ranks the countries of the world by the number of mobile phone numbers in use. ... Vietnam: 72,300,000 90,549,390 79 2013/10 [23] 19 Turkey: 72,200,000
Main lines have been substantially increased, and the use of mobile telephones is growing rapidly. As of 2012, there were 134 million mobile phone subscribers, making Vietnam's rank 6th in the world. [1] Two satellite earth stations are in use: Intersputnik (Indian Ocean region).
Short codes, or short numbers, are short digit-sequences—significantly shorter than telephone numbers—that are used to address messages in the Multimedia Messaging System (MMS) and short message service (SMS) systems of mobile network operators. [1]