Dial USSD code?

Question

When I dial a directly from the handset it works. For example: *123# gets balance of number.

However, when I try to do the same thing from within an application I ge

Answer 1

String encodedHash = Uri.encode("*123#");
startActivityForResult(new Intent("android.intent.action.CALL",
Uri.parse("tel:" + encodedHash)), 1);