My experience with unlocking VZW phones:
Few CSR's know the VZW rules, as working on GSM phones is relatively new / rare for them. You should speak to somebody in their international department who has experience with GSM.
I was told they will only provide an unlock code every 6 months. It will also depend to a certain extent on your customer profile: payment history, time as a customer, etc.
It will not void your warranty. It is a native function of the phone to use whatever SIM is in there. It is the carrier that locks it down, not RIM.
Originally Posted by penguin3107
It might void your warranty. Check with your carrier.