Lets say I am receiving (expected) calls from a company...e.g a bank.

I get the calls from various employees of the bank, all with a different switchboard numbers at their different desks.

e.g 0800 555 1001, 0800 555 1002, 0800 555 1003 etc

Is there any way to add a prefix to your address book........so that all numbers beginning 0800 555 XXXX will show up as coming from that company?

Essentially can I add a company's entire switchboard as a contact to my blackberry?

I believe you have to add the numbers all into a contact. If you don't mind the numbers being mis-labled ("home fax" as an office phone) you can manually type in up to 10 numbers per contact. No automatic way to express a range of numbers though. Shame, as it's something I would use as well.

If you do use all 10 available phone number fields on a contact, and if you save your contacts to your SIM card, remember that only the first number will be saved to the SIM contact. The other 9 will be dropped.

I use a 3rd party program, Message Alerts, which has rules based notifications. One of the rules allows you to trigger on partial numbers.

-jk