Just in case you get tired of living life out of your cell phone, you can always have the feel of an old school landline thanks to Native Union.
For me personally, this would work. For those business folk who have two phone numbers connected to one phone, once you get to the office, you can hook it up to this and treat it as a landline.
If you desire to get up and go, instead of having your calls forwarded to your cell phone, you can just grab it and go. This is one of those things where I go, "now why didn't think of this" lol.