My insurer won't cover my iPhone, despite it obviously being a business essential, which is a shame.
I guess the risk of loss or damage to these expensive bits of kit is just too high.
Insuring separately can be an expensive proposition as well (I think my mate pays something like £15 per month for his). What I've saved by not insuring my phone individually would actually buy a new one! But it's obviously a gamble on my part.