Can you take your own iphone and connect it with virgin mobile?

So, if att has a refurbished iphone5 the one i really want for 149.99 (online only) , or just an iphone5 from somewhere and i buy it, will i be able to take it to virgin mobile and have that for my carrier? Or do i have to buy one of virgin mobile's iphone4/s for over 300.00? I'm trying to find the cheapest way to obtain the phone itself then use virgin mobile for the carrier no matter what since the bill will only be about $55 a month (i want unlimited everything) thank you!

"can you take your own iphone and connect it with virgin mobile?"

No. Virgin Mobile requires that you buy one of their iPhones if you want to have an iPhone on Virgin Mobile.