There is a call function in my app, when users click the phone number in my app, they will be direct to the Phone function.
Here is my code:
document.location.href = 'tel:' + phoneNumber;
Now, I want to calculate the spend time of each phone call. What i think is create a service and write a function with call back, but i don’t know how to judge the call is over. Is that possible if i catch some event when user back to my app? Or can i know when the user press the End Button? Thanks!