Send SMS from an Android device

MainActivity.java

private void sendSMS() {
      /*SEND SMS FROM AN ANDROID PHONE*/
      checkSMSStatePermission();
      String phone = "4455877998";
      String text = "Hellow im sending this SMS from my app";
      SmsManager sms = SmsManager.getDefault();
      sms.sendTextMessage(phone, null, text, null, null);
}

private void checkSMSStatePermission() {
      int permissionCheck = ContextCompat.checkSelfPermission(
              this, Manifest.permission.SEND_SMS);
      if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
          Log.i("Message", "You do not have permission to send SMS!");
          ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.SEND_SMS}, 225);
      } else {
          Log.i("Message", "You have permission to send SMS!");
      }
}

This is how you can send a message from an android phone in your APK.