I think the current Blackberry devices are at least tri-band (900/1800/1900MHz), so just inserting the SIM card in it should be enough for voice calls.
Using the Blackberry service though is another story. You will have to contact Vodafone to try (not sure they will oblige) and have its serial number (PIN) connected to their network and configured to access the Blackberry service. If this is not done you will just have a normal phone.
Also, AFAIK, using the Blackberry Internet service will only give you access to email, nothing else - no Internet applications will work. This is because Vodafone has configured only the Blacberry Enterprise to fully access the Internet. This service requires either your own email server accessible to the Vodafone Blackberry servers, or hosting an email domain with Vodafone.
The only way to be sure is to contact the Vodafone help desk and ask to talk to someone about the Blackberry services.
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