Financial Mail (South Africa), February 6 2009: Trading looks set to become more difficult in Iran for SA-based emerging markets cellular network operator MTN. The telecommunications group is about to face a spirited new competitor in the Islamic republic in the form of Etisalat. United Arab Emirates-based Etisalat, which claims it has 74m customers, mainly in the Middle East, plans to invest billions of dollars in the next few years building a network to rival Irancell. MTN holds a 49%…