If you've already got a home phone that you'd like to keep using, then you're fine to just plug it in and you're away. You just plug your existing handset into the 'Phone' port on your Genius modem and it works as usual.
If you need multiple handsets, or if you need your phone to be in a different place to your modem, then you can go with the following option:
- Genius Black or Genius White + a multi-handset cordless phone base station: there are a number of cordless phone products that include one base station as well as one or two extra handsets with their own charging cradle. Simply plug the phone cable of the base station into the phone port on the Genius, and place the rest of the handsets around the house.