Our service works with both a Mac or PC computer. The only requirement is a broadband connection (e.g. DSL or Cable). We will provide the necessary Phone Adapter-which we provide to you at no cost. Additional Phones Usage: The D&E Jazzd Phone Service for Broadband requires the phone that you wish to use is connected to our Phone Adapter. If you wish to use more than one phone on your D&E Jazzd line, you will need to purchase an expandable cordless phone system. With a cordless phone system you can connect the D&E Jazzd Phone Adapter to the base station of your system and the other expandable handsets will then be D&E Jazzd Phone Service capable. Expandable cordless phone systems are available at any electronics store.