Why doesn't my iPhone 4 show ios7 update?

I just heard that iOS 7 is available for iPhone 4/S, and when you go to settings-General- Software update it shows my iOS is up to date which is 6.1.3…
And I just wanted to know why or is it really supported for the iphone4
I know that it lags cause iPhone 4 has a A4 chip not like the 4S which has a A5 chip…

Well I have an iPhone 4 too. I just went and checked and it said mine is 6.1.3 and updated too. I'm guessing that its not for the iPhone 4…

Because iOS 7 is designed for iPhone 5. The main difference is the app setup. A page of apps on iphone4 can fit 5 apps vertically. IPhone 5 on ios7 supports having 6 apps vertically.
Not only this, but ya know how iPhone 4 has you scroll all the way left to get the search. Well in ios7 you can search from any home screen by swiping down.

Because ios 7 is set to release sometime in fall and it supports iphone 4/ 4s/5

Because ios 7 isn't available unless you are a developer.ios 7 will come to your phone late September

IOS 7 won't be released to the public until the fall, but you can install it early if you register your device's UDID on a site like http://www.instantudid.com/.It's $5, and then you can try out the new OS before everyone else.

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