Verizon's already partnered with AT&T and T-Mobile on the Isis network, but it has fingers in another mobile payment pie -- the Wall Street Journal reports that the carrier's working with Payfone to let you put internet purchases right on your cell phone bill. Mind you, a previous partnership with BilltoMobile already did much the same thing, but Payfone should add more purchase possibilities and generally expand the potential offerings. Yes, perhaps direct carrier billing isn't quite as exciting as