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How to swap an iPhone 6 for a 6s: Doing the math on an early upgrade

New installment and upgrade options require a lot of math and a bit of timing to figure out when to get your next iPhone.

iphone 6s upgrade plan
Apple

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Glenn Fleishman is the author of dozens of books. His most recent, updated for iOS 14, iPadOS 14, and Big Sur, are Take Control of iOS and iPadOS Privacy and Security, Take Control of Your Apple ID, Second Edition, and Take Control of Wireless Networking and Security. He’s a senior contributor to Macworld, where he writes Mac 911.
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