re: Iphone sales sliding?

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t some points, the phones don't really change that much.

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You're right. The features are pretty limited. The biggest jump recently was the iPhone 4s to the iPhone 5 allowing LTE. Other features have been pretty limited, but the IOS upgrades have allowed some nice workflow features.

The biggest difference is that the processor speed eventually becomes an issue on older phones. My wife still has a 4, and the internet became unusable about a year ago. She still had the original IOS iteration, and upgrading to a newer one did not fix the issue.