Bharti Airtel's planned $9 billion acquisition of 15 of Zain's African mobile networks will make it one the five largest mobile operators in the world. According to research firm Wireless Intelligence, the deal is emblematic of the increasing pace of consolidation among the top operators in the world. Interestingly, though, the top 25 carriers still made up around 64 percent of total global connections in the fourth quarter of 2009, unchanged from the year-ago period. The largest U.S. operator, Verizon Wireless, did not crack the top 10, even with its 91 million total subscribers. How did other carriers rank in the global list? Report