Sprint announced Thursday that they will have unlimited data plans available for Apple's iPhone 4S once they reach the stores.

Our unlimited data plans are the perfect fit for iPhone customers, CEO Dan Hesse said in a statement. Sprint's unlimited data plans provide more value than metered plans from other carriers. Our customers can take advantage of the innovative features of iPhone without worrying about overage charges or surprises on their bill.

The iPhone 4S will be available for preorder tomorrow and will hit the stores of all carriers on Oct.14. The phone will cost $199.99 for the 16GB model, $299.99 for the 32GB model and $399.99 for the 64GB with a new-line activation or eligible upgrade along with a two-year agreement.  

Sales began Thursday of the iPhone 4. The phone with iOS 5 costs $99.99.

Sprint has a lot of iPhones they will want to sell. The Wall Street Journal reported earlier in the week that the carrier committed to ordering 30.5 million iPhones, costing $20 billion. Apple has required carriers to purchase their products in bulk.  The company is not expected to break even on the deal until at least 2014.

Sprint is the third-largest wireless carrier in the United States, well behind rivals AT&T and Verizon. Hesse has admitted publicly that some customers have left Sprint because they did not sell the iPhone. In addition, Sprint has been hurt by cost-conscious customers moving toward carriers that offer pre-paid service.

AT&T was the first wireless company to sell the iPhone, while Verizon began selling the iPhone in February. T-Mobile has announced that they have no plans to sell the iPhone in the near future, however that could change if the merger between AT&T and T-Mobile USA is approved by regulators.

Sprint shares are down 3 cents to $2.85 in late-morning trading.