When you receive an incoming call to your phone number, your other telephones (cell, home phone, car phone) will ring as well and the first one answered will be connected to the caller. Basically the call will be routed to all phone sets, which you will list in simultaneous ring option.
The Home Phone system is the solution to saying goodbye to your traditional phone company and to immediately start saving money. Seriously! You can literally save hundreds of dollars every year by using the Home Phone system.