i am the same – i have to carry multiple phones as well …. our company does not allow call forwarding on the mobile phones and ill be damned if im paying for call forwarding on my personal phone.
personal phone/house phone and my work phone and occasionally a foreign country mobile for in country stuff. i ended up just using my small timbuk 2 courier bag when abroad.
work phone i got the smallest shittiest nokia i could get for work – dont notice it in my pocket – with the added bonus of not having emails etc.
i choose to carry 2 phones so i can switch work off/leave it at home out of hours or not on call – as if i use my work phone as my personal phone – folks call it “on the off chance” you will answer.
tempting to adopt the daimler model for holiday emails also – your email has not been forwarded and will be deleted – email someone who cares.
not a fan of the manbag though – looks more than a little camp.