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  2. Method ringing - Wikipedia

    en.wikipedia.org/wiki/Method_ringing

    Each row (or change) is a specific permutation of the bells (for example 123456 or 531246)—that is to say, it includes each bell rung once and only once, the difference from row to row being the order in which the bells follow one another. Plain hunt is the simplest way of creating bell permutations, or changes.

  3. Ringtone - Wikipedia

    en.wikipedia.org/wiki/Ringtone

    The ringing pattern is known as ring cadence, in which the high voltage ring current is switched on and off to create the pattern. In North America, the standard ring cadence is two seconds of ringing followed by four seconds of silence. In Australia and the UK, the standard ring cadence is 400 ms on, 200 ms off, 400 ms on, 2000 ms off.

  4. Ringing tone - Wikipedia

    en.wikipedia.org/wiki/Ringing_tone

    In many cases, the cadence consists of a double ring of 0.4 seconds separated by 0.2 seconds, and a two second pause after which the cadence repeats (0.4s on, 0.2 s off, 0.4 s on, 2 s off). In many cases the tone is a combination of 400 Hz and 450 Hz sine waves.

  5. Why your iPhone won't ring [Video] - AOL

    www.aol.com/news/iphone-isnt-ringing-fix...

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  6. Change ringing - Wikipedia

    en.wikipedia.org/wiki/Change_ringing

    In calling up, The first-called bell moves after the second called bell. In calling down, The first-called bell moves after the second called bell. In Swapping, the bells simply swap position; In all cases, the ringer of the bell immediately above (behind) the swapping pair must also be alert, as that bell follows a new bell after the swap.

  7. List of built-in iOS apps - Wikipedia

    en.wikipedia.org/wiki/List_of_built-in_iOS_apps

    YouTube was an app that was introduced with the release of the original iPhone in iPhone OS 1 which allowed users to find, search, and watch YouTube videos. The built-in YouTube app was removed with the release of iOS 6 in favor of Google (the owner of YouTube) releasing their own app. [ 81 ]

  8. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party.

  9. iPhone - Wikipedia

    en.wikipedia.org/wiki/IPhone

    The iPhone 11, 11 Pro, and 11 Pro Max were announced on September 10, 2019. The iPhone 11 was the successor to the iPhone XR, while the iPhone 11 Pro and 11 Pro Max succeeded the iPhone XS and XS Max. All models gained an Ultra-Wide lens, enabling two-times optical zoom out, as well as larger batteries for longer battery life.