Surely though that's just convenience, you COULD manage without it but it'd require a change in how you plan your life.
In the same way, if I had to I could manage without a mobile. It'd be a proper pain in the **** as a lot of my work is emailed through, but I need to be on it fairly quickly, so I guess I'd be getting someone to check it every time I called in, and I could, as I used to, find a phone box after every job and 'call in'. Sure as hell wouldn't want to though!