HOVIO by Convergenze is the app that allows you to have a landline number on your smartphone so you can make and get calls while being on the go, without having to share your home or office numbers.
(HOVIO, I Have Voice on the Internet Everywhere!)
HOVIO can also be configured so that your landline calls can be forwarded to your smartphone or activate a new landline number on it, no other contracts required.
HOVIO can also be configured as an extension of your switchboard serv so that you can travel while being always reachable.