Associated Press
A man pushes his cart  past an advertisement bill board of Bharti Airtel in Lagos, Nigeria, Sunday, May, 1. 2012. Nigeria has fined four mobile phone carriers a total of $7.3 million over poor service and call quality in Africa's dominant market.Reuben Muoka of the Nigeria Communications Commission said Sunday that Bharti Airtel Ltd. of India, Abu Dhabi-based Etisalat, local firm Globacom Ltd. and South Africa-based MTN Group Ltd. all had been fined. (AP Photos/Sunday Alamba)

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