I am getting a Sprint-branded Samsung Intercept that was rooted and flashed to MetroPCS and runs Froyo. Can I flash it to Virgin Mobile?
If you unlock the phone (as presumably you did to get it on Metro PCS), you should be able to flash the Virgin ROM and activate it on Virgin. However, you should call Virgin and ask! They can best answer this question, and you'll need them to activate the phone on their network anyways.