Question

I am implementing an API based application. As per the requirements I need to show an alert when “No Cellular Network Available”.

Answer 1

To test reachability, use this sample code called Reachability.

To show an alert, use UIAlertView.

Both are in Apple’s documentation.
_{You don’t have to say “you went through the documentation” or “it’s urgent…”. You can just ask questions! That’s what Stack Overflow is for.}