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NEW YORK (CNNMoney.com) -- Mobile phone companies have been lauded for slashing the cost of unlimited voice plans, but many wireless customers' monthly bills are actually going to get a bit more expensive.
Last month, both Verizon (VZ, Fortune 500) and AT&T (T, Fortune 500) lowered their unlimited voice plans by $30 to $70 per month. Sprint (S, Fortune 500) recently unveiled a plan that allows unlimited calls to any mobile device for $60 per month. That brought the three biggest mobile carriers' prices closer to rival T-Mobile, which offers a $60 per month unlimited plan, and in line with a slew of low-cost carriers that offer similar plans for about $40 per month.
But as the wireless giants go around touting their lower voice prices, data plan costs have been quietly moving higher for some non-smartphone customers.
It began with Verizon Wireless. Last month, that company began requiring certain non-smartphone customers to subscribe to a data plan that costs at least $10 per month. Mobile experts believe Verizon's move marks the first step in a larger trend to make up for carriers' lost revenue from voice.