Application Management

I have viber in my iPhone. My wife has viber on her iPad. If one or other of us uses viber to call how can we make the receiver's device notify with a sound if the device is not on. Even if device is on but viber isn't we get no sound notification that we are being called.

And what's its biggest benefit?

Tell us more about your problem. The more detail you provide, the better.

i know this might sound funny but i would wanna know can any one tell me what a router is