The Globe and Mail reports in its Tuesday edition a group of independent Internet providers has launched a challenge of a landmark ruling on wholesale wireless services, arguing the CRTC should have done more to support competition in the cellular industry. The Globe's Christine Dobby writes the Canadian Network Operators Consortium (CNOC) represents 37 Internet service providers and wants to see more regulatory support for "mobile virtual network operators" (MVNOs), which rent access to large cellular providers' airwaves and sell handsets and services under their own brands. The group argues that a model that mandates access at set rates for MVNOs would lead to more competition at the retail level, but the national carriers warn it would undermine Canada's current approach to the wireless industry -- which is to encourage operators to invest in their own infrastructure. CNOC has filed an application asking the CRTC to "review and vary" its May decision on wholesale services in the wireless industry. The main focus of the ruling was wholesale roaming and the CRTC said it will regulate how much the Big Three charge smaller competitors when their customers roam outside of their areas of network coverage.