Verizon's older 3G-only devices that had global capabilities came SIM locked. But that all changed with their LTE devices. Every single one is SIM unlocked for LTE use. That isn't really a big deal because Verizon's LTE bands aren't really in use much of anywhere. But what is a big deal is the phones that have worked GSM functionality are also SIM unlocked for GSM use. Now, whether they're able to function with domestic GSM networks is a little hit or miss. Some of Verizon's LTE devices will work fine with GSM carriers in the U.S. (DNA, iPhone 5, Note 2), but others (RAZR HD/MAXX HD) are only unlocked for use on networks outside of the U.S. How Verizon is able to do that given the agreement is a little unclear, but it's possible that they've done something more hardware based in order to get around it.
Handset locking prohibited. No licensee may disable features on handsets it provides to customers, to the extent such features are compliant with the licensee's standards pursuant to paragraph (b)of this section, nor configure handsets it provides to prohibit use of such handsets on other providers' networks.