I'm sure there are others like myself who only have one phone line that they use for phone & internet use, and are concerned about being able to be reached in an emergency. This is free except for a possible small charge (usually $2 or less) from your local phone company for 'busy call forwarding service'. You can check it out by going to: http://www.callwave.com I have peace of mind now whenever I'm on the internet & my CAH son is away, that I can be reached in an emergency.