Sending SMS issue

i want to send sms from my app.but is not working show an error.Text message not sent. :frowning:
here is my code.

this.smsVar.send("here is my noss", "hi").then((result) => {
      let successToast = this.toastCtrl.create({
        message: "Text message sent successfully! :)",
        duration: 3000
      })
      successToast.present();
    }, (error) => {
      let errorToast = this.toastCtrl.create({
        message: "Text message not sent. :(",
        duration: 3000
      })
      errorToast.present();
    });