(Telecompaper) Belgian mobile operator Base has launched LTE services in 15 cities. With the extensive coverage at launch, Base said it aims to show its high ambitions for 4G. More cities will follow soon, the KPN subsidiary said. Base customers with an unlimited plan from B-39 will receive 4G access automatically. Customers can expect speeds of up to 20 Mbps with a 4G phone, the operator said. Earlier this year the company also upgraded its 3G network with dual-carrier HSPA, offering theoretical speeds of up to 42 Mbps. In addition to the 4G roll-out, Base said it will improve the 3G network further in the coming months. Base is the second operator to launch 4G in Belgium, after Proximus. Mobistar has said it will launch 4G before the end of this year. At the end of June, Proximus covered around 35 percent of the population with 4G. An auction of frequencies in the 800MHz band is planned in November.