Using BB Storm 2 bought in UK here in US

I have just moved to the US from the UK and have an unlocked Blackberry Storm 2 (9520) that was purchased in the UK.  Will I be able to use it with a sim card from Verizon?  I don't want to plunge into a contract and/or, worse, purchase a new phone if I can use the one I already have.  Thanks for any info...the phone has a Vodaphone sim card now which I understand is somehow connected to Verizon in the US.