Been using TPS & MPS for several years now. What a Godsend!!!! Almost zero junk mail & if a phone number comes up as 'International' or 'Witheld', I don't answer it. If its important, the caller will leave a message.....
Also, TPS is available as a business option: TPS Corporate. I work in a small business with 4 phone lines - works a treat & is free!!!!