don't want to sync iTunes library automatically
I've checked Automatically sync when this iPhone is connected in iTunes but don't want to sync my iPhone this time. How can I let it stop before opening it.
Because you've already checked Automatically sync when this iPhone is connected in iTunes, the sync process will initiate as soon as iTunes detects your iPhone is connected.
However, you can stop & quit the sync by clicking on the "sync symbol" button. See screenshot!