I have an iPhone and two Macs -- an old Mac I've been using to manage what's on the phone, and a new one that I've never connected to the phone.
Now I'd like to use the new Mac to buy a couple apps and add them to my phone. (The old machine isn't available right now.)
I don't want to connect my phone to the new machine and have it sync and wipe out the apps and the music that are already on there.
Is there any way to keep what I already have and add some more items using the new Mac?
(The reason I don't just use iTunes on the phone itself is that something I want to get is so large that the phone refuses to download it over the cellular network.)