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The battle of snarkiness between AT&T and Verizon is resulting in benefits for subscribers.

Yesterday, AT&T announced a new unlimited voice and data plan for smartphone owners, including those who use the iPhone, that offers unlimited voice and data service for $99.99 per month. The change was the result of Verizon lowering the cost of its unlimited plans earlier in the day, and consumers are the beneficiaries of the battle of the cell phone titans.

Prior to the announcement, iPhone users paid $100 monthly for unlimited voice, then tacked on another $30 a month for unlimited data. Starting on Monday, January 18th, 2010, a combined unlimited voice and data plan is available for $99.99. That’s a savings of $30 per month. For a Family Talk plan with two iPhones, the deal is even better — $179.99 per month.

Unfortunately, AT&T still charges for text messaging separately, so if you want to add on an unlimited texting plan it’ll be another $20 per month. Beginning on Monday, existing AT&T customers can change to the new plans without penalty or a contract extension by using the online account tools at www.att.com/wireless.

Source: MacRumors