Matthew Panzarino for The Next Web:

Earlier this morning, mobile phone carrier Sprint released its 10-K filing with the SEC for the fiscal year ending in December. In the filing, it revealed that it had made a commitment with Apple to purchase a minimum number of iPhones from Apple amounting to $15.5B in outlay.

Panzarino cites Horace Dediu of Asymco’s back-of-the-envelope average revenue per user (ARPU) projections to come up with a total of 23.8 million iPhones. That’s quite a commitment from Sprint, which just started carrying the iPhone last year.