I can't compare that MVNO (http://en.wikipedia.org/wiki/Mobile_virtual_network_operator ) but I do have a Sprint phone and my son is on Virgin Mobile. Performance is almost identical. If his phone can't connect, neither does mine.
So for Virgin, I think it's the same (yes I know they use the Sprint CDMA system but some want more proof than this.)
I wanted an inexpensive smart phone service that had good coverage in the burbs and boondocks. Sprint CDMA service was good and I knew I would have coverage in the building where I worked because my friend with an old Ipaq (I think) used the Sprint CDMA network. The cost however was more than I was willing to pay. I learned about Boost Mobile which is supposed to use Sprint's CDMA network and decided it was a good choice especially because I could return the phone within 30 days. I bought the LG Marque which speced out to be a good choice. My coverage at work in the same chair my friend sits in was nil, even a voice call had poor quality. So my question is:What gives?? Is this really the same Sprint CDMA network using the same cell towers?