Unlock Verizon 4S iPhone
Verizon will unlock the phone for global use only, provided you've been a customer in good standing for at least 60 days. Otherwise, they will refuse to unlock it, and under no circumstances will they unlock it for domestic use.

Alternatively, you may find unlocking services on eBay, but these aren't as popular for Verizon phones as they are for AT&amp;T.

There are no "Ultrasn0w"-type software unlocks anymore, so going through official channels is the only option, unfortunately.