Sprint iPhone 7 plans. Sprint Plans $50 and $60 Unlimited Plans. We know that after official iPhone 7 release date Sprint will be announced it’s beginning a $50 – 60 per month unlimited plan for the iPhone 7. It’s the best iPhone 7 plan for all who want buy last version iPhone 7 in USA with contract. We know that all Sprint iPhone 7 plans work only for U.S. iPhone 7 owners.