Telecommunication companies are in support of Communications and Multimedia Minister Datuk Seri Ahmad Shabery Cheek's efforts in determining the best solution to the issue of the goods and services tax (GST) on prepaid mobile services.However, they said that implementation of any solution would take time, as it involved numerous issues along the prepaid ecosystem such as updating back-end processes, training front liners and preparing communication materials for consumers."The prepaid market is a complex ecosystem. Hence, it will be a challenge for any mobile service provider to implement the required changes at short notice," U Mobile chief executive officer (CEO) Wong Heang Tuck said.The value chain is further complicated with various top-up options for consumers like physical cards, virtual reloads, Internet and mobile banking as well as ATM machines, he told Bernama.Ninety percent of U Mobile subscribers are prepaid users and 10% are post-paid.U Mobile currently has more than 11,000 traditional dealers and 31,000 alternate