title: How to open whats app and viber chat box for a particular number
body: <p>within my app I want to send messages to whats app and viber. My app is getting a contact number from the server.when click whats app it should open a chat window for that particular number and send the text defined in my app. I used a url to open but it just open the whats app and viber thats all.</p>
  
  <p>How can I open a chat window specific for a number in ios.
  Please help me,
  Thnks</p>