As this is a world phone, it can work on both CDMA (non-sim) and GSM (sim) networks. Some Verizon phones, mostly Blackberries, actually do use sim cards despite most people's perception.
just a FYI flat rate envelopes with a cell phone in it will get crushed your better off doin it in bubble wrap and putting it a $5.20 flat rate small box from the post office you can get the box for free at the post office so it doesnt get crushed when they process it