If I am talking on whatsapp call to someone and another person calls me on my whatsapp. what status will he get. will it show busy? - Quora
I want to give a notification that my phone is busy when somebody try to have a call? How it is possible? - Quora
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How to Redial Busy Phone Lines Automatically on Your iPhone or Android Phone « Smartphones :: Gadget Hacks
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How to Easily and Quickly Send a Custom Busy Message on an iPhone When You Can't Answer the Phone - YouTube
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