...[The] booming telecoms market...has proved too tempting for mobile phone companies to resist. For them,...Sudan's western Darfur region [is] not so much a disaster zone as one more unexploited mobile phone market... Sudan's biggest mobile name is Kuwait's MTC, which bought the Mobitel brand... South Africa's MTN is the latest big arrival. It bought the parent company of Sudan mobile operator Areeba... Sudatel [Sudan Telecom] was one of 31 Sudanese companies blacklisted by Washington in May for allegedly "contributing to the conflict in the Darfur region."...Alcatel-Lucent which has contracts with Sudatel...sent a memo to U.S. nationals on its own staff warning them that they could be personally liable for any business they did with Sudan... [also refers to Canar Telecom, Etisalat; divestment from Sudan by Rolls Royce, Siemens, ABB, CHC Helicopter]