Of course you can. If you no longer have a Verizon account, just turn it on and go. If you still have a Verizon account, you may want to turn on airplane mode to not incur data roaming fees in the off chance it finds a compatible network.
i would still put it in airplane mode to conserve battery life. The battery on these phones are amazing when they aren't searching for signal.
Sent from my Verizon Droid Razr Maxx