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  2. This is why you should never call back an unknown number - AOL

    www.aol.com/article/lifestyle/2019/05/03/this-is...

    So if your bank leaves a voicemail, don’t just call back the number from the missed call. Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says.

  3. 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.

  4. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.

  5. Collect call - Wikipedia

    en.wikipedia.org/wiki/Collect_call

    A caller can dial the operator on 155 and request a reverse charge call. [15] Before these services were discontinued, 08000MUMDAD, 08000686323, 0800 Reverse also provided reverse charge calls. Reverse charge calls can be made for free on some mobile networks, although the person being contacted via this service may be charged a considerable ...

  6. Web callback - Wikipedia

    en.wikipedia.org/wiki/Web_Callback

    A typical Web callback form. Web callback is a technology where a person can enter his or her telephone number in a form on a web site. The company who owns that Web site will then receive the Web callback request and a call center agent will call the person who made the request back on the number they entered.

  7. Callback verification - Wikipedia

    en.wikipedia.org/wiki/Callback_verification

    Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses.The most common target of verification is the sender address from the message envelope (the address specified during the SMTP dialogue as "MAIL FROM").

  8. Callback (telecommunications) - Wikipedia

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

    The server then disconnects the call. Based upon the user name and a list of users' phone numbers, the server will then establish a second call back to the client computer. The client computer, expecting this returned call, will then answer and communications between the two computers will proceed normally.

  9. Automatic callback - Wikipedia

    en.wikipedia.org/wiki/Automatic_callback

    In telecommunications, an automatic callback is a computer telephony calling feature that permits a user, when encountering a busy condition or other condition where the called individual is unavailable, to instruct the system to retain the called number and to establish the call when there is an available line or when the called number is no longer busy.