Where I work, around 95% of us are running around with two phones at all times,
the work phone and the private phone (we don't have landlines at the office
anymore). Only some of the marketing folks have a single, work-paid combo
(not an option for the rest of us due to current taxation regulations).

A lot of our bunch really wish for a dual-SIM phone. It would have to be in
the reasonably priced category (no smartphone) that the company currently
provides us with. I've looked at two Samsung phones, even though they're
not sold around here. Their dual-SIM feature looks good (get calls on any
of the two number, easy choice for which one to call out on). However, their
features are otherwise not up to the current choice of el-cheapo Sony-Ericsson
or Nokia phones.

Edit: Ah, and Bongo's thoughts about using a voice-plan + data-plan card at the same time.. that's interesting too. I've got one of those data plan cards too (which currently sits unused in my Huawei dongle)