Even if you do unlock it, still won't work with Verizon. Verizon and T-Mobile use different networks. It's like trying to play a CD in a cassette player. While it is a similar system, they are not compatible. You may be able to purchase a Sprint handset (compatible with Verizon), no promise.
I am a subscriber to the Verizon Network, by the choice of my parents, unortunatly they have few cool phones. I used the Treo 650, but for a highschool student that is not a very functional phone. I recently became captivated by my friende Samsung SGH-d415 Slliding Phone (http://product.samsung.com/cgi-bin/nabc/product/b2c_product_detail.jsp?eUser=&prod_id=SGH-D415) Unfortunately it only works with T-Mobil. If I unlock it, will it work on the Verizon Network? I read that Verizon does not use GSM, but I am bewildered by all this information. If you have any insight to the matter, please help.