title: How to check user entered phone number is valid or not in Objective c?
body: <p>In my project i have validate a phone number with country code like if user enter number is 44557788991 and select country US.same like for other country how can i check the phone number is valid or not.</p>
  
  <p><img src="https://i.stack.imgur.com/H0EZv.png" alt="enter image description here"></p>
  
  <p>on button click i have to check number is valid or not.</p>