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  2. Collect call - Wikipedia

    en.wikipedia.org/wiki/Collect_call

    There is not a simple way to make a reverse charge call for free in India. In early 2019 a private tech company launched services to enable a person to make an overseas reverse charge call. [9] AT&T also provides a number to make collect calls from India to the United States. The number is 000–117. [10]

  3. Red box (phreaking) - Wikipedia

    en.wikipedia.org/wiki/Red_box_(phreaking)

    A red box is a phreaking device that generates tones to simulate inserting coins in pay phones, thus fooling the system into completing free calls.In the United States, a nickel is represented by one tone, a dime by two, and a quarter by a set of five.

  4. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

  5. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Phreaking began in the 1960s when it was discovered that certain whistles could replicate the 2600 Hz pitch used in phone signalling systems in the United States. [3] Phone phreaks experimented with dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure ...

  6. Telecommunications tariff - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_tariff

    Emergency calls can invariably be made without charge. Most countries have a number sequence that enable the caller to make calls without charge, sometimes known as free calls or freephone, these are usually used by companies for their sales line (in the UK these are 0800 and 0808 numbers and in the US they are 800, 888, 877, 866, 855, 844 and ...

  7. AOL.com - AOL Help

    help.aol.com/products/aol

    Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. AOL.com.