Re: Dumb Question
Correct, but some finer details on that.
Presently Virgin Mobile use EE for billing and mast coverage. EE in turn use Virgin Media's infra for their data network. It's a scratch my back and I'll scratch yours kind of agreement.
so, VM didn't have any sort of mobile stack of their own up until about 18 months ago when they went live with a new stack provided by Huawei. That stack cost em a hundred million quid!
The idea of the new stack was that VM can handle the billing on their own and choose whoever they like for mast supply.