iOS 8 on the iPhone 4S: Performance isn't the (only) problem
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New OS wants screen space and processing power that the old phone doesn't have.
Apple's Claims of Improved Performance on iPhone 4s and iPad 2 With iOS 8.1.1 Put to the Test - MacRumors
Apple iPhone 4S: What's In It For You vs iPhone 4?
iPhone 4S Review
Apple iPhone 4S review: Apple iPhone 4S - CNET
iPhone 4s - Wikipedia
iOS 4 review
How to Get Better iPhone 4s Performance on iOS 8
Why You Shouldn't Buy the iPhone 4s Today
Unable to sign in app store on iphone 4s - Apple Community
iPhone 4S review - The Verge
iPhone 4S Review [Updated] - SlashGear
Verizon Wireless iPhone 4S review: Verizon Wireless iPhone 4S - CNET
Will Apple stop supporting iOS on iPhones older than five years old? - Quora
What are some reasons why the iPhone seems to be getting less durable every year? - Quora
