Can i use a iphone from any company an get it unlocked to use on virgin mobile?

That's pretty much it lol. Just wondering bc I want an iPhone. Please explain why or why not.

No. None of the iPhones in the US will work Virgin Mobile. You can buy an iPhone 4 or 4S directly from Virgin Mobile so why not just do that? Yes, it's expensive, but you're going to be paying the same price really no matter what. Buying it outright from another carrier costs just as much, and buying one on contract and then cancelling the contract is barely cheaper. This is for Virgin Mobile in the US, though; if you're in Canada, you can use an iPhone from Telus or Rogers on Virgin Mobile Canada.