Phone Number not clickable on IOS

I have using Ionic 1 and on my app I am using a phone number. If the user clicks the phone number then I want the number to open in the call window so that user can directly call that number. It is perfectly working on android. But unfortunately it is not working on IOS. Following codes emphasizes what I have tried so far -

On my HTML file -
<a href="tel:*******">******</a>
<a target="_blank" ng-href="tel:*******">******</a> //also tried this

On my Config.xml file -
<access origin="tel:*" launch-external="yes" />
<access origin="mailto:*" launch-external="yes" >

<allow-intent href="tel:*" />

I have tried all the solutions suggested on the below link including changing the config file, using the cordova call number plugin and the codes. But I can not get it to work on IOS. I have tested on IOS 6s device with IOS version 10.

I can not understand what I am doing wrong. Thanks in advance for any kind of help.

Try with:

<a href="#" onclick=“‘tel:12345’, ‘_system’);”>

Thank you for your answer. Actually I have tried it too. I have called a function which had the same code ('tel:12345', '_system');). it did not work. Could be there any version problem?

Try to debug your app… run it into xcode and see the console log, maybe it’s a problem with permissions?