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How do I add a phone number extension to a contact in a way that it will dial the extension automatically a few seconds after a call is connected? I have seen 4 different ways that appear to work on different devices. "p", "w", ";" and ",". Is there one official way that works across devices and Android versions?

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In the dialer in Stock ICS and jellyBean it only uses the following:

  • Pause: ',' - pauses then sends the remaining digits
  • Wait: ';' - waits for you to confirm sending of the remaining digits.
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