AT&T today confirmed reports that it plans to increase the cost of its old, grandfathered unlimited plan early next year. The rate will change from $30 per month to $35 per month, and marks the first increase this plan has seen in seven years. The change goes into effect in February. T-Mobile and Verizon have increased the prices of their unlimited plans in recent weeks, too. T-Mobile's unlimited data plan jumped from $30 per month to $45 per month, while Verizon's hopped from $30 to $50. AT&T no longer offers unlimited data to customers, and instead charges for defined buckets of LTE 4G access. Only customers who've maintained their old data plan over the years still have access to unlimited data. AT&T throttles the speeds of unlimited customers who surpass 22GB of usage in a single billing period.