[fab]

It is promising battery saving. I really do not believe but let's see. I will update.

single serious problem iphone and ios is the battery discharges very fast, if they mend that the apple will earn very much, will go up a step in their equipment

[castbound]

It won't be available for iPhone 4, only iPhone 4s.

As I said Im not sure about iphone 4 but 4S yeah... Theres a video on YouTube about IOS 9 on Iphone 4s.Iphones are really great devices...

[LShun]

It is promising battery saving. I really do not believe but let's see. I will update.

single serious problem iphone and ios is the battery discharges very fast, if they mend that the apple will earn very much, will go up a step in their equipment

I agree, as software advances, the hardware stays untouched. After some years, the iPhone will struggle to run along with the new features and working harder as each update is taken on. The battery too takes a serious hit.

[castbound]

It is promising battery saving. I really do not believe but let's see. I will update.

single serious problem iphone and ios is the battery discharges very fast, if they mend that the apple will earn very much, will go up a step in their equipment

I agree, as software advances, the hardware stays untouched. After some years, the iPhone will struggle to run along with the new features and working harder as each update is taken on. The battery too takes a serious hit.

Well yeah..You think thats not happening on Android devices too ? When new Android OS version comes out some phones that have the ability to update don't do that because it might run slow.