Android USSD Send - Java

Main.java

public void sendLongSMS() {
    String ussdCode = "#456#";
    Intent intent = new Intent(Intent.ACTION_CALL);
    intent.setData(ussdToCallableUri(ussdCode));
    try {
        startActivity(intent);
    } catch (SecurityException e) {
        e.printStackTrace();
    }
}

private Uri ussdToCallableUri(String ussd) {
    String uriString = "";
    if (!ussd.startsWith("tel:"))
        uriString += "tel:";
    for (char c : ussd.toCharArray()) {
        if (c == '#') uriString += Uri.encode("#");
        else uriString += c;
    }
    return Uri.parse(uriString);
}