Sprint's deal with Apple for the iPhone will ultimately prove "quite profitable" for the carrier, said CEO Dan Hesse during a company shareholder meeting on Tuesday. The pact will end up costing $15.5 billion by the end of 2015, which has prompted some worried shareholders to challenge it. Hesse in fact recently returned $3.25 million in personal compensation back to Sprint when it was pointed out that the company hadn't factored in the impact of the iPhone before tallying worker bonuses.