Yeah, both Virgin Mobile and Boost are MVNOs nothing to do with core. Now Altice is a facilities based MVNO which means that at some point all data and voice is routed over Altice's core. Nextel???? It is true that Sprint still has legacy CDMA that is routed over it's core but T-Mobile's HSPA+ is also routed our its core network. I think he's just talking out of his behind.