What is the difference between an iphone 4g and a iphone verizon?

i was wondering what What the difference is between the iphone 4g and the iphone verizon?, from what i can tell there is not so much a difference as much as there is not a iphone 4 for the verizon, verizon is basically a network, now in america iphone's run on at&t but now some iphones can run on verizon, i need to check this out what actual iphones run on the verizon network though.

i am not sure if or when is Verizon on the iPhone 4 yet, will check this for the next blog post i think, cause it is conflicting it sounds like the iphone 4g will only be for at&t, all this will probably be happening in 2011 with the iphone 4g and which networks the iphone 4g in 2011 like at&t or verizon in 2011.