Since there is no JB option available on the 4S right now (thus unable to use the iBlacklist app).....is there a "workaround" method to sending incoming Private/Blocked/Unknown phone calls DIRECTLY to voicemail? Currently I have set my default ringtone to SILENT (and assigned other ringtones to my contacts) but "Unknown" incoming calls still display on the screen when calling. I've read that there is a way to use GOOGLE VOICE to accomplish this but I don't know exactly how. If someone knows of a way to send Unknown calls directly to VM, please advice. Thanks in advance.