Ionic Phone Call not working in Phonegap Android

I have developed a ionic project and i went through many blogs here which helped me in implementing phonecall.
But i am testing it through phonegap.
When i enter the url and test it in chrome browser phonecall works well but when i implement it in phonegap, dialer button not opening the phone’s dialer menu.

I dont know what to be done.
Can anyone guide and sort this issue out?

My code here:

I have an array list of phone numbers and i am printing them through an icon.