My husband has a blackberry. And mainly it is just for work. As he has alot of emails and telephone calls that would be against the law to send on a normal network.

i.e. his office email address is not accessibile anywhere in the country outside his office.

What he found is that being incredibly busy he can take the blackberry with him and recieve those all important calls and emails on a private network. And it keeps him in touch and up to date.