I am unable to download iOS 7 on my iPhone 3Gs. Why? I have iOS 6.1.6 and if I want to download "Find My iPhone", it requires iOS 7. I've tried to search on what else I can do, but cannot figure it out. I also have about 10 GB of free memory out of 13 GB.
IOS – Why can’t I download iOS 7 on the iPhone 3Gs
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Best Answer
You cannot download it because iOS 7 is not supported on any iPhone model prior to the iPhone 4. The latest version of iOS that will run on the 3Gs is iOS 6.1.6 -- which you have.
Here's a fantastic compatibility chart for iOS 7:
Source: http://cdn.theapplelounge.com/wp-content/uploads/2013/06/iOS-7-Comparison-Chart-definitivo-1.jpg
Note the complete absence of the iPhone 3G and 3GS models.