Telstra, Optus, TPG and NBN Co will pay just over $7.3 billion to keep expiring mobile and wireless spectrum licenses after the sector’s efforts to lobby for lower costs were rejected. The Australian Communications and Media Authority (ACMA) today handed down a final price ruling [pdf] for the expiring licenses of $7.32 billion, $20 million lower than its preliminary finding of $7.34 billion last December.