Italy’s Competition Authority (Autorita Garante della Concorrenza e del Mercato, AGCM) has confirmed that it has launched an investigation into possible collusion between the country’s four main telcos, Telecom Italia (TIM), Wind Tre, Vodafone and Fastweb. The probe is looking at whether the companies worked together before introducing new monthly billing cycles. The watchdog also asked the antitrust unit of the Guardia di Finanza to inspect the offices of local industry body Assotelecomunicazioni (Asstel). Under legislation implemented in 2017, telcos were required to switch from 28-day billing cycles to monthly bills. The AGCM says the investigation will be completed by 31 March 2019.