Lots of the greatest broadband companies – reminiscent of BT, EE, Plusnet, Shell Vitality, TalkTalk, Virgin Media and Vodafone – elevate costs each April consistent with the Client Value Index (CPI) or the Retail Value Index (RPI) – introduced as February as 4% and 4.9% respectively – plus a further 3%, 3.7% or 3.9%.