Verizon and ATT both have a Home Cell Phone that plugs in. After you disconnect the house from the wired line coming in just plug the house into the new box. Now all your house phones including wireless phones can be used just like you had a wired line. My Verizon version costs me about $25/month for unlimited calls in USA. It runs on a 12 volt wall wart so we take it along on vacation and plug it into the campers 12 volts with a homemade cord. You can also forward it to a cell phone if your not going to be home. Had ours for about 5 years now. We recently moved to a different state and are debating if we should keep the number from our old address so we don't have to change numbers everywhere or stop confusing the locals and switch it to a local number.