Idea Cellular has rolled out a pilot SIM card-based fleet tracking service in partnership with Delhi-based provider of maps and tracking services MapmyIndia. Under the partnership, Idea is offering SIM cards to customers, who need to activate them with a certain credit balance for each trip every time. Meanwhile, MapmyIndia has developed the back-end platform that fetches data from delegated Idea SIM cards and places it over its own maps. Idea has so far signed on four clients for the service, including its sister companies Hindalco Industries and Grasim Industries, and Sterlite Technologies.