Can't Make Phone Calls
I am not able to make phone calls since “Phone” icon does not show any phone No. and I am unable to type a No. also.
iPhone 4S, iOS 9.0.2
You are looking at "Recents", which will, of course, be empty if you have not sent or received a recent call.
Click "Contacts" on the bottom -- or "Keypad" on the bottom if you wish to place a call.