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The total revenue of the top-10 telecom groups reached US$709.1bn in 2011, an increase of nearly 8% from the year before. The top-10 telecom groupsâ€™ cumulated revenue represents about 44% of the total of the 243 monitored telecom groups worldwide. Half of the groups in the ranking are European operators â€” with Spainâ€™s TelefÃ³nica ranking 5th, the largest among the ...