Ios11 buttons not working

Ionic Native
1

my app is working well on android device.
However, some buttons are not working on iOS device.

on safari and Chrome, i can see my data on console.log()
it shows phone number and href link.

but on iOS device, it is not working.
i don’t know why they are not working on device.

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'));
  }
}



goWebsites() {
    console.log(this.websiteUrl);
    this.iab.create(this.websiteUrl, "_system");
}

please help me to solve this problem