It is possible to connect iphone 3G syncing with 2 apple machine?

1. It is possible to connect iphone 3G syncing with 2 apple machine (1 imac which i using in home lower version &
MacPro5,1 is i am using in office.) Please let know in which i can both the machine.
2. And i not able to install any apps in which is compatability with iphone ios 4.2 ver.
It says some error.
Thanks & Regards
JS

By design, the iPhone syncs or manually manages iTunes content with ONE computer at a time. Thus, it is not possible to do what you want. You need to pick one computer & stick with that computer.
You are correct, the iPhone 3G cannot be updated past iOS 4.2.1...the end of the line for that model iPhone. Thus, any apps that require a higher iOS version will not install or run on your phone.

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