Some find it annoying that iPhoto on the Mac opens every time they plug in their iPhone to synch it with the computer. iPhoto opens up as soon as the phone is plugged in – even when there are no photos on iPhone’s “Camera Roll.” To stop this from happening, there is a preference in iPhoto that needs to be changed.

Here's what you do:

Open iPhoto->Preferences->General. Change the option “Connecting camera opens” option to “No application”. Close iPhoto.

The next time you plug in your iPhone, iPhoto will not open. To synch photos from the iPhone’s “Camera Roll” change iPhoto’s preferences back so that “Connecting camera opens – iPhoto.”