1. A method of billing for a mobile network service provided to a mobile device by a virtual network operator comprising: identifying a network service provided to the mobile device via a mobile network on behalf of the virtual network operator; determining a price of the network service provided to the mobile device via the mobile network; submitting information representative of an invoice for the network service provided to the mobile device, wherein the user is billed on ‘behalf of the mobile network service provider by the virtual network operator.