Verizon iPhone 5 comes gsm unlocked so if the esn is bad can you still use gsm?

I was wondering sense the iPhone 5 for Verizon come GSM unlocked, if the ESN is bad can it still be used with GSM networks? Please let me know thanks

If you try to activate a phone with a bad ESN you will probably get in trouble because the only reason the ESN would have an issue is if it was reported lost or stolen.