Can you use an unlocked iphone4 on Virgin Mobile?

I use Virgin Mobile (and love it!) I just noticed that they are carrying the iphone 4 now! I have the Optimus Elite, and want the iphone 4. But I don't want to pay $350 for one. Can I purchase an Unlocked iphone and call virgin mobile or go online and switch my number and plan to the iphone? Or would they know that I did not purchase it from them? How do you even know if an iphone is unlocked? When meeting to purchase from someone?

Added (1). Two totally polar opposite answers! I don't see how ONLY VM phones will work with VM. Because VM can't go into the iphone and add or change anything, hence it is owned by apple. So if one is unlocked, it isn't linked to any carrier.

Yes you can its allowed… You can tell if its unlocked if it doesn't have any logos on it becides apple

Nope only a VM iphone will work on VM

same reason an unlocked att iphone 4 won't work on sprint or verizon.
gsm and cdma iphones don't work on each other carriers.

no iphone has any logos on it besides apple

Only phones sold by VM will work on VM

No, you can't use an unlocked phone on Virgin Mobile. "Unlocked" means the phone will take any sim card. Now, look at you VM phone, and try to find a sim card slot under the battery. I bet you won't find it. And you know why? Because VM uses CDMA technology, where no sim card is needed.
And now you can answer your question yourself.So, can you use a sim card phone on VM if these phones are not compatible with VM?

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