Agreed with kingnba6. If your device is jailbroken, iBlacklist can block calls, SMS, and mms. The price tag is $12 but it can block calls, send em to voicemail or give busy or let it just keep ringing. It can block SMS or auto reply. It is a very nice tweak. Very useful for even blocked numbers, etc. and the trial will let you use 2 numbers for however long the trial is.