Reason

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Reason android application provides you a highly productive and unique ability right on screen at the time of calling.

Same will be shown to users of this app right when they see your call incoming

Example : You want to call Andy and let him know that the party is cancelled, doesn't matter if Andy picks up the phone, or just sees the call and discards it, or misses the call, its our job to get the message sent to Andy soonest possible time , right when he sees the call