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The purchase and use of Apple products are subject to additional terms and conditions found at https://www.apple.com/legal/sla/ and https://www.apple.com/legal/warranty/.
Making unauthorized modifications to the software on an iPhone violates the iPhone software license agreement. The common term for modifying an iPhone is jail-breaking, with a particular emphasis on the second part of that term. That’s why we strongly, almost emphatically, recommend that you do not do so. Really. Should you be unable to use your iPhone due to an unauthorized software modification, its repair will not be covered under the warranty.
https://www.apple.com/legal/sales-support/sales-policies/retail_us.html