Executive Vice Chairman of the Nigeria Communications Commission (NCC), Ernest Ndukwe, has warned that the numerous taxations and other levies imposed on GSM operators by states and local governments are discouraging further investments in the sector by GSM companies. Ndukwe who spoke to Vanguard exclusively last week said as a result of these levies many operators have not been able to build base stations and other infrastructure in may parts of the country for the past one year.