Can I get a virgin mobile plan with a sprint iPhone 4?

I have a sprint iPhone 4 running 6.1.0
I want to get a $30/month contract-free plan with 300 minutes and
unlimited texting/data. It says I need to buy a phone from them.
If virgin mobile plans are powered by sprint, can I use my phone)
If not, I can just trade it on craiglist. Thanks!

PS- can I pay my bills online with PayPal?

I remember looking around for this, as far as i could see no. There's not prepaid contract free version for the iphone. I'm pretty sure paying your bills through paypal is fine though.

You would have to go to any small tech or cell phone store and have your phone flashed to be able to get linked to the next provider. Independent tech companies can always do it cheaper than the larger retail stores.

Getting your phone flashed usually takes a day and cost around 50-100 dollars depending.

Nah, VM requires you to purchase a phone from them.
If that was possible, everyone with iPhones would be switching to them.