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  2. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    A toll-free telephone number or freephone number is a ... toll-free numbers are drawn from the US SMS/800 database. A seven-digit number 310 ... In Vietnam, the ...

  3. Telephone numbers in Vietnam - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Vietnam

    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.

  4. Premium-rate telephone number - Wikipedia

    en.wikipedia.org/wiki/Premium-rate_telephone_number

    In Vietnam, 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).

  5. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). If there is only 32.. followed by any other, shorter number, like 32 51 724859, this is the number of a normal phone, not a mobile. 46x: Join (discontinued mobile phone service provider) [3] 47x: Proximus (or other) 48x

  6. How to make sure texts and calls are encrypted after the FBI ...

    www.aol.com/news/sure-texts-calls-encrypted-fbis...

    Telecommunications companies tend to temporarily store call and SMS records — which phone number called or texted which, and when — and they briefly store the contents of SMS texts. Audio ...

  7. Mobile phone spam - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_spam

    Spam on the display screen of a Vietnamese mobile phone.. Mobile phone spam is a form of spam (unsolicited messages, especially advertising), directed at the text messaging or other communications services of mobile phones or smartphones.

  8. List of emergency telephone numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_emergency...

    106 – emergency number in Australia for textphone/TTY; 108 – emergency number in India (22 states) 110 – emergency number mainly in China, Japan, Taiwan; 111 – emergency number in New Zealand; 112 – emergency number across the European Union and on GSM mobile networks across the world; 119 – emergency number in Jamaica and parts of Asia

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