Call() is not working on iOS 11+

Ionic Framework ionic-v3
1

call() is working on Android but it is not working on iOS 11+.

call() {
    if(this.phone) {
      this.callNumber.callNumber(this.phone, false)
        .then(() => console.log('Launched dialer!'))
        .catch(() => console.log('Error launching dialer'));
  }
}

i set up same as the other project which is working properly on Android and iOS 11+.
Anyone can help me to solve this problem?
i have no idea which files should i check.

Thanks.

2

Check the contents of error in catch((error) => {}
That will give you an explaination

3

Thank You for answering my question.
i checked the content by console.log()
i can see phone number and it is working fine on Android.
it is not only working on iOS ( iPhone ).
Anyone can help me to solve this problem??

This is my .ts

call() {
    console.log(this.phone);
    if(this.phone) {
      this.callNumber.callNumber(this.phone, false)
        .then(() => console.log('Launched dialer!'))
        .catch(() => console.log('Error launching dialer'));
  }
}
sendSms() {
    console.log(this.smsNumber);
    if(this.smsNumber) {
        var options = {
            replaceLineBreaks: false,
            android: {
                intent: 'INTENT'
            }
        };
      this.sms.send(this.smsNumber, "", options)
        .then(() => console.log('Launched dialer!'))
        .catch(() => console.log('Error launching dialer'));
  }
}

these *.ts is not working on iOS.