Jan.18, 2010 -- The battle for cell phone users is intensifying. Starting today, both Verizon Wireless and AT&T are cutting prices on their unlimited calling plans. Verizon made the first move, saying it will start charging $70 a month for an unlimited calling plan, down from $100 a month. AT&T matched its rival's announcement on Friday. But both companies are requiring more customers to buy data plans used to access the Internet and check e-mail on smartphones.
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