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  2. Telephone numbers in Brazil - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Brazil

    The second digit of non-geographic number prefixes is the number 0, and the number is usually disclosed for national calls in the form 0a0b-nnn-nnnn and is occasionally disclosed in the international format for whatsapp contacts in the form +55 a0b-nnn-nnnn. Some 0800 numbers are 6-digit only, being that such lines generally have high user traffic.

  3. Oi (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Oi_(telecommunications)

    Oi Fixo (landline service, formerly Telefone Telemar) Oi Móvel (mobile service, cornerstone of the Oi brand) Oi Velox (ADSL, 3G formerly Velox) Oi Internet (ISP) 31 (long-distance and international calling) Oi Wi-Fi (Wi-Fi access, at home or via hotspots) Oi TV (DTH pay TV) Oi Voip (Voice over IP) In 2010, Portugal Telecom acquired 22.4% of Oi ...

  4. Telephone numbers in Angola - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Angola

    Telephone numbers in Angola are 9 digits long (except for special 1xx service numbers like Police and Emergency services), [1] and must always be dialed in their entirety. Land-line (fixed-line) numbers start with digit 2, followed by 1 or 2 digits area code that corresponds to a geographic area. [2]

  5. Telesp - Wikipedia

    en.wikipedia.org/wiki/Telesp

    Telesp - Telecomunicações de São Paulo S.A. was the telephony operator of the Telebrás system in the Brazilian state of São Paulo, [1] successor to the Companhia Telefônica Brasileira (CTB), [2] later incorporating the Companhia de Telecomunicações do Estado de São Paulo (COTESP) and other smaller companies.

  6. Telephone number - Wikipedia

    en.wikipedia.org/wiki/Telephone_number

    A Swiss rotary telephone dial from the 1970s showing the telephone's number (94 29 68), along with those of various local emergency services Telephone numbers for sale in Hong Kong

  7. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Popular codecs include the MDCT-based AAC-LD (used in FaceTime), the LPC/MDCT-based Opus (used in WhatsApp), the LPC-based SILK (used in Skype), μ-law and A-law versions of G.711, G.722, and an open source voice codec known as iLBC, a codec that uses only 8 kbit/s each way called G.729.