The CMA also took aim at the market for mobile virtual network operators (MVNOs) — a set up aimed at increasing competition by enabling new carriers to set up and offer services without building all of their own costly communications infrastructure. Both Three and Vodafone supply network to MVNOs, with the list including iD Mobile and Lebara. The CMA said that a merger might make it more difficult for MVNOs to access reasonable wholesale deals, in turn making services more expensive for customers.