It’s hard to declare a clear victor here, given that T-Mobile and Sprint structure their plans differently. But purely from a price perspective, T-Mobile works out better if you intend to buy your phone outright down the road. Sprint should be cheaper if you need unlimited data and plan to continually swap out for a new phone.
Both plans are much less expensive than Apple’s own plan, which starts at $32.41 per month for an iPhone 6s, with one free upgrade per year. But this does include AppleCare+ coverage, and gives you the freedom to roam between any carrier you want.
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