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  2. Talkatone - Wikipedia

    en.wikipedia.org/wiki/Talkatone

    Over time, the app evolved to provide users with its own free phone numbers and the ability to make free calls and send texts to most phone number in the United States and Canada. [ 2 ] In May 2014, Talkatone was acquired by Ooma , [ 6 ] [ 7 ] a company known for its VoIP services and home and office phone solutions.

  3. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    Mobile phones roaming on a foreign network will often be provided with a ringback tone from the network they are temporarily hosted on. For example, calling a US phone in Europe may return a European ringback tone or vice versa. Increasingly, networks may opt to play their own domestic tones instead, making roaming seamless.

  4. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    The calls were transmitted by cable, communications satellite, radio, and more recently, fiber optics and Voice over Internet Protocol (VoIP). International direct dialling was introduced in the 1970s, so calls can be dialed by country code without an operator. International calls can be paid via telephone card (aka phone

  5. 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 ...

  6. Tone control circuit - Wikipedia

    en.wikipedia.org/wiki/Tone_control_circuit

    Tone control is a type of equalization used to make specific pitches or frequencies in an audio signal softer or louder. It allows a listener to adjust the tone of the sound produced by an audio system to their liking, for example to compensate for inadequate bass response of loudspeakers or earphones, tonal qualities of the room, or hearing impairment.

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    Originally, all calls were routed manually by an operator who would look for small light bulbs that would illuminate when a subscriber picked up the phone to make a call. The operator would connect a handset to the line, ask the user who they were calling, and then connect a cable between two phone jacks to complete the call.

  9. AOL Mail - AOL Help

    help.aol.com/products/aol-webmail

    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

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