Silent SMS is a sms filter, it allows you to define rules for incoming SMS to whitelist or blacklist. If a SMS contains a words or phrases or a pattern characters that should be blacklisted, it will receive the SMS without notification. Pro version allows for blacklisted SMS to be discarded and not saved into your SMS messages.IMPORTANT NOTE:After enabling notification in Silent SMS, you need to go to the default SMS application and disable notification otherwise you will hear your phone beep twice upon every SMS received.