Backed by its Rs18,000-crore follow on public offer, Vodafone Idea (Vi) has started beefing up its 4G coverage and network capacity from its priority UP and Uttarakhand circles by deploying more airwaves in the 900 MHz band. The company plans to add a 900 MHz band layer, which will significantly enhance indoor network experience for its customers in the two circles. “The deployment of L900 coverage will be beneficial in urban areas with dense building infrastructure, as well as suburban and rural areas where signal penetration is a challenge,” Vi said in a statement Thursday.