What are you using to sync your calendar and address book? iCloud? Gmail? I don't see why that stops you from updating your phone sans computer.
I have been using iTunes to sync my calendar and address book between my phone and the computer.
iTunes versions older than yesterday's release are now prevented from communicating with iOS 9 devices.
Yesterday's iTunes release now requires a new computer to use it. Apple just implemented an unnecessary change that prevents me from being able to update to iOS 9 on my phone and still sync with my computer, or even have my computer aware that the phone is there.
iOS 9 is not worth buying another computer.
Apple has a history of trying to force consumers to buy new hardware. This latest move is perhaps the most ridiculous maneuvers yet.
It's nice in the PC world. Your devices and computers are supported until you decide to upgrade.
Unfortunately, my Mac needs to remain the primary syncing machine for now.
But I've got the other part of my life moving back towards Windows and Android. The support and compatibility can't be beat.
I've put some old PC's back in use, and installed Windows 10 on them, and they work great. My newer Macs were abandoned by Apple's OS a long time ago.
This added method of forcing you to buy a newer computer just because your phone got updated is ridiculous.
If they want more money from me, they'll have to earn it with better machines, more reasonable prices, and better support.
It's ridiculous that the only thing preventing OS 10.8.x or later from installing on my Mac Pro is Apple's blessing and a couple entries in a file. It is nice that Windows 10 installed on it without a single complaint (64-BIT Windows 10).
When the projects that I'm involved with that require OS X and iPhone syncing are done, I'll be abandoning ship. Sorry Apple, done with this game.