Currently Being ModeratedNov 21, 2012 8:33 PM (in response to AntonioF2)
iPhone: About unlocking - http://support.apple.com/kb/HT5014 - Only some carriers offer the ability to unlock iPhone for use on any carrier. Follow the instructions in this article to unlock your iPhone.
iPhone: Wireless carrier support and features - http://support.apple.com/kb/HT1937 - including a list of which ones offer unlocking.
Currently Being ModeratedNov 22, 2012 4:42 AM (in response to AntonioF2)
Virign Mobile, like all CDMA carriers, will only activate devices on their network that were initially sold for use on their network.
Sell your current iPhone and buy one from Virgin Mobile.