The iPhone cannot be used because it requires a newer version of iTunes. And I have already downloaded iTunes and this message still keeps popping up
You need to be running iTunes 12.2 or higher to sync with an iDevice running iOS 9. Your computer may have the highest version that it can run, but it may not be 12.2....
Best of luck,
GB
That's from More Like This at the bottom of this thread. You will find the answer there.
I don't think it says that. You can still use it, you just can't sync it.
iOS9 on a mobile device requires iTunes 12.3 or higher which in turn requires a computer running OSX 10.8.5 or higher. System Update only checks for updates for the current system version you are running but that itself may be out of date. It may or may not be possible to upgrade your computer to the required system:
You can either buy a download code for OSX 10.8 Mountain Lion from Apple online, or you can try installing the free El Capitan OSX 10.11. El Capitan may run slower on older machines and require additional RAM purchase. Doing a big jump in system versions is also more likely to affect old software.
Snow leopard to el capitan, will it cause my macbook to be slow? - https://discussions.apple.com/thread/7412959
Mountain Lion 10.8 purchase link U.S.A. - http://www.apple.com/shop/product/D6377Z/A/os-x-mountain-lion
Mountain Lion 10.8 purchase link U.K. - http://www.apple.com/uk/shop/product/D6377ZM/A/os-x-mountain-lion
Current OSX general upgrade information, including system requirements - http://www.apple.com/osx/how-to-upgrade/
If you have any PPC generation software that has been running under OSX 10.6 it will not be supported under any later system versions.
The iPhone cannot be used because it requires a newer version of iTunes
