How can I stop phone calls interrupting my Viber calls on Android 2.3?

ghaith elqasem April 11, 2013
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I am using Android 2.3.6. How can I stop an incoming call from disconnecting a Viber call without switching to airplane mode?

I want to be able to receive Viber and standard mobile calls and if I am using of them, give the other a busy line.


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