The way we buy smartphones is changing rapidly, and now carriers are locked in a back and forth game of undercutting to provide users with the most attractive deals.
Earlier today, Sprint mildly adjusted its iPhone upgrade plan such that qualified customers can now trade in their existing smartphones and get a new iPhone 6s for just $15 per month. Without a trade-in, users can still get a new iPhone 6s for just $26 per month.
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