Sprint Nextel has entered into a multi-year deal with Apple as part of its agreement to carry the iPhone that will see the number three U.S. carrier purchase a guaranteed number of iPhones over the next four years. Citing people familiar with the matter, the Wall Street Journal reports that Sprint has agreed to purchase 30.5 million iPhones—$20 billion worth, at current rates—over the next four years whether or not it is able to sell them…
