A:Answer Virgin Mobile, being a CDMA provider, only allows Virgin mobile-branded handsets on its network - They do not offer a "bring your own phone" scenario. The only compatible handsets are from Verizon or Sprint, and some Sprint handsets can be activated on Virgin, but only if carrier unlocked and with a clean ESN record.
Your best bet might be to get an unlocked GSM phone and look at one of the MVNO/Pre-paid providers that offer BYO Phone SIM cards.